diff --git a/docs/reference/LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md b/docs/reference/LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md
index 28d1ef9..57fe699 100644
--- a/docs/reference/LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md
+++ b/docs/reference/LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md
@@ -1,23 +1,24 @@
 ------------------------------------------------------------------------
 
-## \<{}
+## \<\{\}
 
 Function
 
 
-       ... a \<{}
+       ... a <{}
     ----------------
        ... [] a
 
 
 ### Definition
 
-    \[\] swap
+    [] swap
 
 ### Discussion
 
-Lorem ipsum.
+Tuck an empty list just under the first item on the stack.
 
 ### Crosslinks
 
-Lorem ipsum.
+[<<{}](#section-18)
+
diff --git a/docs/reference/LESS-THAN-SIGN•LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md b/docs/reference/LESS-THAN-SIGN•LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md
index 6d887fc..78cfb09 100644
--- a/docs/reference/LESS-THAN-SIGN•LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md
+++ b/docs/reference/LESS-THAN-SIGN•LESS-THAN-SIGN•LEFT-CURLY-BRACKET•RIGHT-CURLY-BRACKET.md
@@ -1,29 +1,25 @@
 ------------------------------------------------------------------------
 
-## \<\<{}
+## \<\<\{\}
 
-Basis Function Combinator
+Function
 
-\[\] rollup
 
-Gentzen diagram.
+       ... b a <{}
+    -----------------
+       ... [] b a
+
 
 ### Definition
 
-if not basis.
+    [] rollup
 
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
 
 ### Discussion
 
-Lorem ipsum.
+Tuck an empty list just under the first two items on the stack.
 
 ### Crosslinks
 
-Lorem ipsum.
+[<{}](#section-16)
+
diff --git a/docs/reference/QUESTION-MARK.md b/docs/reference/QUESTION-MARK.md
index d132f07..949ea90 100644
--- a/docs/reference/QUESTION-MARK.md
+++ b/docs/reference/QUESTION-MARK.md
@@ -2,28 +2,20 @@
 
 ## ?
 
-Basis Function Combinator
+Function
 
-dup bool
-
-Gentzen diagram.
+Is the item on the top of the stack "truthy"?
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> [dup](#dup) [bool](#bool)
 
 ### Discussion
 
-Lorem ipsum.
+You often want to test the truth value of an item on the stack without
+consuming the item.
 
 ### Crosslinks
 
-Lorem ipsum.
+[bool](#bool)
+
diff --git a/docs/reference/VERTICAL-LINE•VERTICAL-LINE.md b/docs/reference/VERTICAL-LINE•VERTICAL-LINE.md
index 5adb253..5408aa9 100644
--- a/docs/reference/VERTICAL-LINE•VERTICAL-LINE.md
+++ b/docs/reference/VERTICAL-LINE•VERTICAL-LINE.md
@@ -2,28 +2,31 @@
 
 ## \|\|
 
-Basis Function Combinator
+Combinator
 
-nulco \[nullary\] dip \[true\] branch
+Short-circuiting Boolean OR
 
-Gentzen diagram.
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> [nulco](#nulco) \[[nullary](#nullary)\] [dip](#dip) \[true\] [branch](#branch)
 
 ### Discussion
 
-Lorem ipsum.
+Accept two quoted programs, run the first and expect a Boolean value, if
+it’s `false` pop it and run the second program (which should also return a
+Boolean value) otherwise pop the second program (leaving `true` on the
+stack.)
+
+       [A] [B] ||
+    ---------------- A -> false
+            B
+
+
+       [A] [B] ||
+    ---------------- A -> true
+          true
 
 ### Crosslinks
 
-Lorem ipsum.
+[&&](#section-1)
diff --git a/docs/reference/abs.md b/docs/reference/abs.md
index 48ae162..9308ff5 100644
--- a/docs/reference/abs.md
+++ b/docs/reference/abs.md
@@ -2,28 +2,11 @@
 
 ## abs
 
-Basis Function Combinator
+Function
 
 Return the absolute value of the argument.
 
-Gentzen diagram.
-
 ### Definition
 
-if not basis.
+> \[0 <\] \[0 [swap](#swap) -\] \[\] [ifte](#ifte)
 
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
-
-### Crosslinks
-
-Lorem ipsum.
diff --git a/docs/reference/add.md b/docs/reference/add.md
index beeb282..dfd769b 100644
--- a/docs/reference/add.md
+++ b/docs/reference/add.md
@@ -2,28 +2,7 @@
 
 ## add
 
-Basis Function Combinator
+Basis Function
 
-Same as a + b.
+Add two numbers together: a + b.
 
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
-
-### Crosslinks
-
-Lorem ipsum.
diff --git a/docs/reference/anamorphism.md b/docs/reference/anamorphism.md
index d873b3c..159120c 100644
--- a/docs/reference/anamorphism.md
+++ b/docs/reference/anamorphism.md
@@ -2,28 +2,26 @@
 
 ## anamorphism
 
-Basis Function Combinator
+Combinator
 
-\[pop \[\]\] swap \[dip swons\] genrec
+Build a list of values from a generator program `G` and a stopping
+predicate `P`.
 
-Gentzen diagram.
+               [P] [G] anamorphism
+    -----------------------------------------
+       [P] [pop []] [G] [dip swons] genrec
 
 ### Definition
 
-if not basis.
+> \[[pop](#pop) \[\]\] [swap](#swap) \[[dip](#dip) [swons](#swons)\] [genrec](#genrec)
 
-### Derivation
+### Example
 
-if not basis.
+The `range` function generates a list of the integers from 0 to n - 1:
 
-### Source
-
-if basis
+> \[0 <=\] \[\-\- dup\] anamorphism
 
 ### Discussion
 
-Lorem ipsum.
+See the [Recursion Combinators notebook](https://joypy.osdn.io/notebooks/Recursion_Combinators.html).
 
-### Crosslinks
-
-Lorem ipsum.
diff --git a/docs/reference/and.md b/docs/reference/and.md
index 551bd71..56c4522 100644
--- a/docs/reference/and.md
+++ b/docs/reference/and.md
@@ -2,27 +2,10 @@
 
 ## and
 
-Basis Function Combinator
+Basis Function
 
-Same as a & b.
+Logical bit-wise AND.
 
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
 
 ### Crosslinks
 
diff --git a/docs/reference/mkref/FuncRef.html b/docs/reference/mkref/FuncRef.html
index f4df306..41c37ec 100644
--- a/docs/reference/mkref/FuncRef.html
+++ b/docs/reference/mkref/FuncRef.html
@@ -171,9 +171,9 @@
 <li><a href="#section-13">&lt;</a></li>
 <li><a href="#section-14">&lt;=</a></li>
 <li><a href="#section-15">&lt;&gt;</a></li>
-<li><a href="#section-16">&lt;</a></li>
+<li><a href="#section-16">&lt;{}</a></li>
 <li><a href="#section-17">&lt;&lt;</a></li>
-<li><a href="#section-18">&lt;&lt;</a></li>
+<li><a href="#section-18">&lt;&lt;{}</a></li>
 <li><a href="#section-19">%</a></li>
 <li><a href="#section-20">+</a></li>
 <li><a href="#section-21">++</a></li>
@@ -429,35 +429,32 @@
 <h2 id="section-15">&lt;&gt;</h2>
 <p>See <a href="#ne">ne</a>.</p>
 <hr />
-<h2 id="section-16">&lt;</h2>
+<h2 id="section-16">&lt;{}</h2>
 <p>Function</p>
-<pre><code>   ... a \&lt;{}
+<pre><code>   ... a &lt;{}
 ----------------
    ... [] a</code></pre>
 <h3 id="definition-2">Definition</h3>
-<pre><code>\[\] swap</code></pre>
+<pre><code>[] swap</code></pre>
 <h3 id="discussion-2">Discussion</h3>
-<p>Lorem ipsum.</p>
+<p>Tuck an empty list just under the first item on the stack.</p>
 <h3 id="crosslinks-1">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#section-18">&lt;&lt;{}</a></p>
 <hr />
 <h2 id="section-17">&lt;&lt;</h2>
 <p>See <a href="#lshift">lshift</a>.</p>
 <hr />
-<h2 id="section-18">&lt;&lt;</h2>
-<p>Basis Function Combinator</p>
-<p>[] rollup</p>
-<p>Gentzen diagram.</p>
+<h2 id="section-18">&lt;&lt;{}</h2>
+<p>Function</p>
+<pre><code>   ... b a &lt;{}
+-----------------
+   ... [] b a</code></pre>
 <h3 id="definition-3">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-1">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source">Source</h3>
-<p>if basis</p>
+<pre><code>[] rollup</code></pre>
 <h3 id="discussion-3">Discussion</h3>
-<p>Lorem ipsum.</p>
+<p>Tuck an empty list just under the first two items on the stack.</p>
 <h3 id="crosslinks-2">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#section-16">&lt;{}</a></p>
 <hr />
 <h2 id="section-19">%</h2>
 <p>See <a href="#mod">mod</a>.</p>
@@ -469,19 +466,16 @@
 <p>See <a href="#succ">succ</a>.</p>
 <hr />
 <h2 id="section-22">?</h2>
-<p>Basis Function Combinator</p>
-<p>dup bool</p>
-<p>Gentzen diagram.</p>
+<p>Function</p>
+<p>Is the item on the top of the stack &#x201C;truthy&#x201D;?</p>
 <h3 id="definition-4">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-2">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-1">Source</h3>
-<p>if basis</p>
+<blockquote>
+<p><a href="#dup">dup</a> <a href="#bool">bool</a></p>
+</blockquote>
 <h3 id="discussion-4">Discussion</h3>
-<p>Lorem ipsum.</p>
+<p>You often want to test the truth value of an item on the stack without consuming the item.</p>
 <h3 id="crosslinks-3">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#bool">bool</a></p>
 <hr />
 <h2 id="section-23">/</h2>
 <p>See <a href="#floordiv">floordiv</a>.</p>
@@ -493,78 +487,59 @@
 <p>See <a href="#floordiv">floordiv</a>.</p>
 <hr />
 <h2 id="section-25">||</h2>
-<p>Basis Function Combinator</p>
-<p>nulco [nullary] dip [true] branch</p>
-<p>Gentzen diagram.</p>
+<p>Combinator</p>
+<p>Short-circuiting Boolean OR</p>
 <h3 id="definition-5">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-3">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-2">Source</h3>
-<p>if basis</p>
+<blockquote>
+<p><a href="#nulco">nulco</a> [<a href="#nullary">nullary</a>] <a href="#dip">dip</a> [true] <a href="#branch">branch</a></p>
+</blockquote>
 <h3 id="discussion-5">Discussion</h3>
-<p>Lorem ipsum.</p>
+<p>Accept two quoted programs, run the first and expect a Boolean value, if it&#x2019;s <code>false</code> pop it and run the second program (which should also return a Boolean value) otherwise pop the second program (leaving <code>true</code> on the stack.)</p>
+<pre><code>   [A] [B] ||
+---------------- A -&gt; false
+        B
+
+
+   [A] [B] ||
+---------------- A -&gt; true
+      true</code></pre>
 <h3 id="crosslinks-4">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p><a href="#section-1">&amp;&amp;</a></p>
 <hr />
 <h2 id="abs">abs</h2>
-<p>Basis Function Combinator</p>
+<p>Function</p>
 <p>Return the absolute value of the argument.</p>
-<p>Gentzen diagram.</p>
 <h3 id="definition-6">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-4">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-3">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-6">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-5">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<blockquote>
+<p>[0 &lt;] [0 <a href="#swap">swap</a> -] [] <a href="#ifte">ifte</a></p>
+</blockquote>
 <hr />
 <h2 id="add">add</h2>
-<p>Basis Function Combinator</p>
-<p>Same as a + b.</p>
-<p>Gentzen diagram.</p>
-<h3 id="definition-7">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-5">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-4">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-7">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-6">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p>Basis Function</p>
+<p>Add two numbers together: a + b.</p>
 <hr />
 <h2 id="anamorphism">anamorphism</h2>
-<p>Basis Function Combinator</p>
-<p>[pop []] swap [dip swons] genrec</p>
-<p>Gentzen diagram.</p>
-<h3 id="definition-8">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-6">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-5">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-8">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-7">Crosslinks</h3>
-<p>Lorem ipsum.</p>
+<p>Combinator</p>
+<p>Build a list of values from a generator program <code>G</code> and a stopping predicate <code>P</code>.</p>
+<pre><code>           [P] [G] anamorphism
+-----------------------------------------
+   [P] [pop []] [G] [dip swons] genrec</code></pre>
+<h3 id="definition-7">Definition</h3>
+<blockquote>
+<p>[<a href="#pop">pop</a> []] <a href="#swap">swap</a> [<a href="#dip">dip</a> <a href="#swons">swons</a>] <a href="#genrec">genrec</a></p>
+</blockquote>
+<h3 id="example">Example</h3>
+<p>The <code>range</code> function generates a list of the integers from 0 to n - 1:</p>
+<blockquote>
+<p>[0 &lt;=] [-- dup] anamorphism</p>
+</blockquote>
+<h3 id="discussion-6">Discussion</h3>
+<p>See the <a href="https://joypy.osdn.io/notebooks/Recursion_Combinators.html">Recursion Combinators notebook</a>.</p>
 <hr />
 <h2 id="and">and</h2>
-<p>Basis Function Combinator</p>
-<p>Same as a &amp; b.</p>
-<p>Gentzen diagram.</p>
-<h3 id="definition-9">Definition</h3>
-<p>if not basis.</p>
-<h3 id="derivation-7">Derivation</h3>
-<p>if not basis.</p>
-<h3 id="source-6">Source</h3>
-<p>if basis</p>
-<h3 id="discussion-9">Discussion</h3>
-<p>Lorem ipsum.</p>
-<h3 id="crosslinks-8">Crosslinks</h3>
+<p>Basis Function</p>
+<p>Logical bit-wise AND.</p>
+<h3 id="crosslinks-5">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="app1">app1</h2>
@@ -574,9 +549,9 @@
 <pre><code>         ... x [Q] app1
 ---------------------------------
    ... [x ...] [Q] infra first</code></pre>
-<h3 id="definition-10">Definition</h3>
+<h3 id="definition-8">Definition</h3>
 <pre><code>nullary popd</code></pre>
-<h3 id="discussion-10">Discussion</h3>
+<h3 id="discussion-7">Discussion</h3>
 <p>Just a specialization of <code>nullary</code> really. Its parallelizable cousins are more useful.</p>
 <hr />
 <h2 id="app2">app2</h2>
@@ -587,15 +562,15 @@
 </dd>
 </dl>
 <p>Gentzen diagram.</p>
-<h3 id="definition-11">Definition</h3>
+<h3 id="definition-9">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-8">Derivation</h3>
+<h3 id="derivation-1">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-7">Source</h3>
+<h3 id="source">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-11">Discussion</h3>
+<h3 id="discussion-8">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-9">Crosslinks</h3>
+<h3 id="crosslinks-6">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="app3">app3</h2>
@@ -606,30 +581,30 @@
 </dd>
 </dl>
 <p>Gentzen diagram.</p>
-<h3 id="definition-12">Definition</h3>
+<h3 id="definition-10">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-9">Derivation</h3>
+<h3 id="derivation-2">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-8">Source</h3>
+<h3 id="source-1">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-12">Discussion</h3>
+<h3 id="discussion-9">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-10">Crosslinks</h3>
+<h3 id="crosslinks-7">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="appn">appN</h2>
 <p>Basis Function Combinator</p>
 <p>[grabN] codi map disenstacken</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-13">Definition</h3>
+<h3 id="definition-11">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-10">Derivation</h3>
+<h3 id="derivation-3">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-9">Source</h3>
+<h3 id="source-2">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-13">Discussion</h3>
+<h3 id="discussion-10">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-11">Crosslinks</h3>
+<h3 id="crosslinks-8">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="at">at</h2>
@@ -639,15 +614,15 @@
 <p>Basis Function Combinator</p>
 <p>[sum] [size] cleave /</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-14">Definition</h3>
+<h3 id="definition-12">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-11">Derivation</h3>
+<h3 id="derivation-4">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-10">Source</h3>
+<h3 id="source-3">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-14">Discussion</h3>
+<h3 id="discussion-11">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-12">Crosslinks</h3>
+<h3 id="crosslinks-9">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="b">b</h2>
@@ -656,17 +631,17 @@
 <pre><code>   [P] [Q] b
 ---------------
       P Q</code></pre>
-<h3 id="definition-15">Definition</h3>
+<h3 id="definition-13">Definition</h3>
 <pre><code>[i] dip i</code></pre>
-<h3 id="derivation-12">Derivation</h3>
+<h3 id="derivation-5">Derivation</h3>
 <pre><code>[P] [Q] b
 [P] [Q] [i] dip i
 [P] i [Q] i
  P    [Q] i
  P     Q</code></pre>
-<h3 id="discussion-15">Discussion</h3>
+<h3 id="discussion-12">Discussion</h3>
 <p>This combinator comes in handy.</p>
-<h3 id="crosslinks-13">Crosslinks</h3>
+<h3 id="crosslinks-10">Crosslinks</h3>
 <p><a href="#dupdip">dupdip</a> <a href="#ii">ii</a></p>
 <hr />
 <h2 id="binary">binary</h2>
@@ -675,11 +650,11 @@
 <pre><code>   ... y x [P] binary
 -----------------------
         ... A</code></pre>
-<h3 id="definition-16">Definition</h3>
+<h3 id="definition-14">Definition</h3>
 <pre><code>unary popd</code></pre>
-<h3 id="discussion-16">Discussion</h3>
+<h3 id="discussion-13">Discussion</h3>
 <p>Runs any other quoted function and returns its first result while consuming exactly two items from the stack.</p>
-<h3 id="crosslinks-14">Crosslinks</h3>
+<h3 id="crosslinks-11">Crosslinks</h3>
 <p><a href="#nullary">nullary</a> <a href="#ternary">ternary</a> <a href="#unary">unary</a></p>
 <hr />
 <h2 id="bool">bool</h2>
@@ -687,15 +662,15 @@
 <p>bool(x) -&gt; bool</p>
 <p>Returns True when the argument x is true, False otherwise. The builtins True and False are the only two instances of the class bool. The class bool is a subclass of the class int, and cannot be subclassed.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-17">Definition</h3>
+<h3 id="definition-15">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-13">Derivation</h3>
+<h3 id="derivation-6">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-11">Source</h3>
+<h3 id="source-4">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-17">Discussion</h3>
+<h3 id="discussion-14">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-15">Crosslinks</h3>
+<h3 id="crosslinks-12">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="branch">branch</h2>
@@ -711,30 +686,30 @@ True [F] [T] branch
 -------------------------
       T</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-18">Definition</h3>
+<h3 id="definition-16">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-14">Derivation</h3>
+<h3 id="derivation-7">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-12">Source</h3>
+<h3 id="source-5">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-18">Discussion</h3>
+<h3 id="discussion-15">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-16">Crosslinks</h3>
+<h3 id="crosslinks-13">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ccccons">ccccons</h2>
 <p>Basis Function Combinator</p>
 <p>ccons ccons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-19">Definition</h3>
+<h3 id="definition-17">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-15">Derivation</h3>
+<h3 id="derivation-8">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-13">Source</h3>
+<h3 id="source-6">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-19">Discussion</h3>
+<h3 id="discussion-16">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-17">Crosslinks</h3>
+<h3 id="crosslinks-14">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ccons">ccons</h2>
@@ -743,11 +718,11 @@ True [F] [T] branch
 <pre><code>   B A [...] ccons
 ---------------------
       [B A ...]</code></pre>
-<h3 id="definition-20">Definition</h3>
+<h3 id="definition-18">Definition</h3>
 <pre><code>cons cons</code></pre>
-<h3 id="discussion-20">Discussion</h3>
+<h3 id="discussion-17">Discussion</h3>
 <p>Does <code>cons</code> twice.</p>
-<h3 id="crosslinks-18">Crosslinks</h3>
+<h3 id="crosslinks-15">Crosslinks</h3>
 <p><a href="#cons">cons</a></p>
 <hr />
 <h2 id="choice">choice</h2>
@@ -763,15 +738,15 @@ A B true choice
   B</code></pre>
 <p>Currently Python semantics are used to evaluate the "truthiness" of the Boolean value (so empty string, zero, etc. are counted as false, etc.)</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-21">Definition</h3>
+<h3 id="definition-19">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-16">Derivation</h3>
+<h3 id="derivation-9">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-14">Source</h3>
+<h3 id="source-7">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-21">Discussion</h3>
+<h3 id="discussion-18">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-19">Crosslinks</h3>
+<h3 id="crosslinks-16">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="clear">clear</h2>
@@ -784,45 +759,45 @@ A B true choice
 </dd>
 </dl>
 <p>Gentzen diagram.</p>
-<h3 id="definition-22">Definition</h3>
+<h3 id="definition-20">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-17">Derivation</h3>
+<h3 id="derivation-10">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-15">Source</h3>
+<h3 id="source-8">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-22">Discussion</h3>
+<h3 id="discussion-19">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-20">Crosslinks</h3>
+<h3 id="crosslinks-17">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="cleave">cleave</h2>
 <p>Basis Function Combinator</p>
 <p>fork popdd</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-23">Definition</h3>
+<h3 id="definition-21">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-18">Derivation</h3>
+<h3 id="derivation-11">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-16">Source</h3>
+<h3 id="source-9">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-23">Discussion</h3>
+<h3 id="discussion-20">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-21">Crosslinks</h3>
+<h3 id="crosslinks-18">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="clop">clop</h2>
 <p>Basis Function Combinator</p>
 <p>cleave popdd</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-24">Definition</h3>
+<h3 id="definition-22">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-19">Derivation</h3>
+<h3 id="derivation-12">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-17">Source</h3>
+<h3 id="source-10">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-24">Discussion</h3>
+<h3 id="discussion-21">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-22">Crosslinks</h3>
+<h3 id="crosslinks-19">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="cmp">cmp</h2>
@@ -840,45 +815,45 @@ a b [G] [E] [L] cmp
 ------------------------- a &lt; b
      L</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-25">Definition</h3>
+<h3 id="definition-23">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-20">Derivation</h3>
+<h3 id="derivation-13">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-18">Source</h3>
+<h3 id="source-11">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-25">Discussion</h3>
+<h3 id="discussion-22">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-23">Crosslinks</h3>
+<h3 id="crosslinks-20">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="codi">codi</h2>
 <p>Basis Function Combinator</p>
 <p>cons dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-26">Definition</h3>
+<h3 id="definition-24">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-21">Derivation</h3>
+<h3 id="derivation-14">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-19">Source</h3>
+<h3 id="source-12">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-26">Discussion</h3>
+<h3 id="discussion-23">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-24">Crosslinks</h3>
+<h3 id="crosslinks-21">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="codireco">codireco</h2>
 <p>Basis Function Combinator</p>
 <p>codi reco</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-27">Definition</h3>
+<h3 id="definition-25">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-22">Derivation</h3>
+<h3 id="derivation-15">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-20">Source</h3>
+<h3 id="source-13">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-27">Discussion</h3>
+<h3 id="discussion-24">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-25">Crosslinks</h3>
+<h3 id="crosslinks-22">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="concat">concat</h2>
@@ -888,15 +863,15 @@ a b [G] [E] [L] cmp
 ----------------------------
     [a b c d e f]</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-28">Definition</h3>
+<h3 id="definition-26">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-23">Derivation</h3>
+<h3 id="derivation-16">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-21">Source</h3>
+<h3 id="source-14">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-28">Discussion</h3>
+<h3 id="discussion-25">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-26">Crosslinks</h3>
+<h3 id="crosslinks-23">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="cond">cond</h2>
@@ -907,15 +882,15 @@ a b [G] [E] [L] cmp
 -----------------------------------------
 [B0] [T0] [[B1] [T1] [D] ifte] ifte</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-29">Definition</h3>
+<h3 id="definition-27">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-24">Derivation</h3>
+<h3 id="derivation-17">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-22">Source</h3>
+<h3 id="source-15">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-29">Discussion</h3>
+<h3 id="discussion-26">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-27">Crosslinks</h3>
+<h3 id="crosslinks-24">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="cons">cons</h2>
@@ -924,26 +899,26 @@ a b [G] [E] [L] cmp
 <pre><code>   A [...] cons
 ------------------
      [A ...]</code></pre>
-<h3 id="source-23">Source</h3>
+<h3 id="source-16">Source</h3>
 <pre><code>func(cons, [list(A), B|S], [list([B|A])|S]).</code></pre>
-<h3 id="discussion-30">Discussion</h3>
+<h3 id="discussion-27">Discussion</h3>
 <p>Cons is a venerable old function from Lisp. It doesn&#x2019;t inspect the item but it will not cons onto a non-list. It&#x2019;s inverse operation is called <code>uncons</code>.</p>
-<h3 id="crosslinks-28">Crosslinks</h3>
+<h3 id="crosslinks-25">Crosslinks</h3>
 <p><a href="#ccons">ccons</a> <a href="#uncons">uncons</a></p>
 <hr />
 <h2 id="dinfrirst">dinfrirst</h2>
 <p>Basis Function Combinator</p>
 <p>dip infrst</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-30">Definition</h3>
+<h3 id="definition-28">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-25">Derivation</h3>
+<h3 id="derivation-18">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-24">Source</h3>
+<h3 id="source-17">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-31">Discussion</h3>
+<h3 id="discussion-28">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-29">Crosslinks</h3>
+<h3 id="crosslinks-26">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dip">dip</h2>
@@ -953,15 +928,15 @@ a b [G] [E] [L] cmp
 -------------------
   ... Q x</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-31">Definition</h3>
+<h3 id="definition-29">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-26">Derivation</h3>
+<h3 id="derivation-19">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-25">Source</h3>
+<h3 id="source-18">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-32">Discussion</h3>
+<h3 id="discussion-29">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-30">Crosslinks</h3>
+<h3 id="crosslinks-27">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dipd">dipd</h2>
@@ -971,15 +946,15 @@ a b [G] [E] [L] cmp
 ---------------------
   ... Q y x</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-32">Definition</h3>
+<h3 id="definition-30">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-27">Derivation</h3>
+<h3 id="derivation-20">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-26">Source</h3>
+<h3 id="source-19">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-33">Discussion</h3>
+<h3 id="discussion-30">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-31">Crosslinks</h3>
+<h3 id="crosslinks-28">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dipdd">dipdd</h2>
@@ -989,30 +964,30 @@ a b [G] [E] [L] cmp
 -----------------------
   ... Q z y x</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-33">Definition</h3>
+<h3 id="definition-31">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-28">Derivation</h3>
+<h3 id="derivation-21">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-27">Source</h3>
+<h3 id="source-20">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-34">Discussion</h3>
+<h3 id="discussion-31">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-32">Crosslinks</h3>
+<h3 id="crosslinks-29">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="disenstacken">disenstacken</h2>
 <p>Basis Function Combinator</p>
 <p>The disenstacken operator expects a list on top of the stack and makes that the stack discarding the rest of the stack.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-34">Definition</h3>
+<h3 id="definition-32">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-29">Derivation</h3>
+<h3 id="derivation-22">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-28">Source</h3>
+<h3 id="source-21">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-35">Discussion</h3>
+<h3 id="discussion-32">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-33">Crosslinks</h3>
+<h3 id="crosslinks-30">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="div">div</h2>
@@ -1023,30 +998,30 @@ a b [G] [E] [L] cmp
 <p>divmod(x, y) -&gt; (quotient, remainder)</p>
 <p>Return the tuple (x//y, x%y). Invariant: q * y + r == x.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-35">Definition</h3>
+<h3 id="definition-33">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-30">Derivation</h3>
+<h3 id="derivation-23">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-29">Source</h3>
+<h3 id="source-22">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-36">Discussion</h3>
+<h3 id="discussion-33">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-34">Crosslinks</h3>
+<h3 id="crosslinks-31">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="down_to_zero">down_to_zero</h2>
 <p>Basis Function Combinator</p>
 <p>[0 &gt;] [dup --] while</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-36">Definition</h3>
+<h3 id="definition-34">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-31">Derivation</h3>
+<h3 id="derivation-24">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-30">Source</h3>
+<h3 id="source-23">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-37">Discussion</h3>
+<h3 id="discussion-34">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-35">Crosslinks</h3>
+<h3 id="crosslinks-32">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="drop">drop</h2>
@@ -1057,60 +1032,60 @@ a b [G] [E] [L] cmp
 ----------------------
     [c d]</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-37">Definition</h3>
+<h3 id="definition-35">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-32">Derivation</h3>
+<h3 id="derivation-25">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-31">Source</h3>
+<h3 id="source-24">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-38">Discussion</h3>
+<h3 id="discussion-35">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-36">Crosslinks</h3>
+<h3 id="crosslinks-33">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dup">dup</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 -- a1 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-38">Definition</h3>
+<h3 id="definition-36">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-33">Derivation</h3>
+<h3 id="derivation-26">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-32">Source</h3>
+<h3 id="source-25">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-39">Discussion</h3>
+<h3 id="discussion-36">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-37">Crosslinks</h3>
+<h3 id="crosslinks-34">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dupd">dupd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a2 a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-39">Definition</h3>
+<h3 id="definition-37">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-34">Derivation</h3>
+<h3 id="derivation-27">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-33">Source</h3>
+<h3 id="source-26">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-40">Discussion</h3>
+<h3 id="discussion-37">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-38">Crosslinks</h3>
+<h3 id="crosslinks-35">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dupdd">dupdd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a3 a2 a1 -- a3 a3 a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-40">Definition</h3>
+<h3 id="definition-38">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-35">Derivation</h3>
+<h3 id="derivation-28">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-34">Source</h3>
+<h3 id="source-27">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-41">Discussion</h3>
+<h3 id="discussion-38">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-39">Crosslinks</h3>
+<h3 id="crosslinks-36">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dupdip">dupdip</h2>
@@ -1122,105 +1097,105 @@ a b [G] [E] [L] cmp
 ... a a   [F] dip
 ... a F a</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-41">Definition</h3>
+<h3 id="definition-39">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-36">Derivation</h3>
+<h3 id="derivation-29">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-35">Source</h3>
+<h3 id="source-28">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-42">Discussion</h3>
+<h3 id="discussion-39">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-40">Crosslinks</h3>
+<h3 id="crosslinks-37">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="dupdipd">dupdipd</h2>
 <p>Basis Function Combinator</p>
 <p>dup dipd</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-42">Definition</h3>
+<h3 id="definition-40">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-37">Derivation</h3>
+<h3 id="derivation-30">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-36">Source</h3>
+<h3 id="source-29">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-43">Discussion</h3>
+<h3 id="discussion-40">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-41">Crosslinks</h3>
+<h3 id="crosslinks-38">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="enstacken">enstacken</h2>
 <p>Basis Function Combinator</p>
 <p>stack [clear] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-43">Definition</h3>
+<h3 id="definition-41">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-38">Derivation</h3>
+<h3 id="derivation-31">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-37">Source</h3>
+<h3 id="source-30">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-44">Discussion</h3>
+<h3 id="discussion-41">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-42">Crosslinks</h3>
+<h3 id="crosslinks-39">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="eq">eq</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a == b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-44">Definition</h3>
+<h3 id="definition-42">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-39">Derivation</h3>
+<h3 id="derivation-32">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-38">Source</h3>
+<h3 id="source-31">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-45">Discussion</h3>
+<h3 id="discussion-42">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-43">Crosslinks</h3>
+<h3 id="crosslinks-40">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="first">first</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 ...1] -- a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-45">Definition</h3>
+<h3 id="definition-43">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-40">Derivation</h3>
+<h3 id="derivation-33">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-39">Source</h3>
+<h3 id="source-32">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-46">Discussion</h3>
+<h3 id="discussion-43">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-44">Crosslinks</h3>
+<h3 id="crosslinks-41">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="first_two">first_two</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 ...1] -- a1 a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-46">Definition</h3>
+<h3 id="definition-44">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-41">Derivation</h3>
+<h3 id="derivation-34">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-40">Source</h3>
+<h3 id="source-33">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-47">Discussion</h3>
+<h3 id="discussion-44">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-45">Crosslinks</h3>
+<h3 id="crosslinks-42">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="flatten">flatten</h2>
 <p>Basis Function Combinator</p>
 <p>&lt;{} [concat] step</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-47">Definition</h3>
+<h3 id="definition-45">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-42">Derivation</h3>
+<h3 id="derivation-35">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-41">Source</h3>
+<h3 id="source-34">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-48">Discussion</h3>
+<h3 id="discussion-45">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-46">Crosslinks</h3>
+<h3 id="crosslinks-43">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="floor-1">floor</h2>
@@ -1228,105 +1203,105 @@ a b [G] [E] [L] cmp
 <p>Return the floor of x as an Integral.</p>
 <p>This is the largest integer &lt;= x.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-48">Definition</h3>
+<h3 id="definition-46">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-43">Derivation</h3>
+<h3 id="derivation-36">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-42">Source</h3>
+<h3 id="source-35">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-49">Discussion</h3>
+<h3 id="discussion-46">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-47">Crosslinks</h3>
+<h3 id="crosslinks-44">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="floordiv">floordiv</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a // b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-49">Definition</h3>
+<h3 id="definition-47">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-44">Derivation</h3>
+<h3 id="derivation-37">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-43">Source</h3>
+<h3 id="source-36">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-50">Discussion</h3>
+<h3 id="discussion-47">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-48">Crosslinks</h3>
+<h3 id="crosslinks-45">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="fork">fork</h2>
 <p>Basis Function Combinator</p>
 <p>[i] app2</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-50">Definition</h3>
+<h3 id="definition-48">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-45">Derivation</h3>
+<h3 id="derivation-38">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-44">Source</h3>
+<h3 id="source-37">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-51">Discussion</h3>
+<h3 id="discussion-48">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-49">Crosslinks</h3>
+<h3 id="crosslinks-46">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="fourth">fourth</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 a3 a4 ...1] -- a4)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-51">Definition</h3>
+<h3 id="definition-49">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-46">Derivation</h3>
+<h3 id="derivation-39">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-45">Source</h3>
+<h3 id="source-38">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-52">Discussion</h3>
+<h3 id="discussion-49">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-50">Crosslinks</h3>
+<h3 id="crosslinks-47">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="gcd">gcd</h2>
 <p>Basis Function Combinator</p>
 <p>true [tuck mod dup 0 &gt;] loop pop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-52">Definition</h3>
+<h3 id="definition-50">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-47">Derivation</h3>
+<h3 id="derivation-40">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-46">Source</h3>
+<h3 id="source-39">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-53">Discussion</h3>
+<h3 id="discussion-50">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-51">Crosslinks</h3>
+<h3 id="crosslinks-48">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="gcd2">gcd2</h2>
 <p>Basis Function Combinator</p>
 <p>Compiled GCD function.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-53">Definition</h3>
+<h3 id="definition-51">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-48">Derivation</h3>
+<h3 id="derivation-41">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-47">Source</h3>
+<h3 id="source-40">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-54">Discussion</h3>
+<h3 id="discussion-51">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-52">Crosslinks</h3>
+<h3 id="crosslinks-49">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ge">ge</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &gt;= b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-54">Definition</h3>
+<h3 id="definition-52">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-49">Derivation</h3>
+<h3 id="derivation-42">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-48">Source</h3>
+<h3 id="source-41">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-55">Discussion</h3>
+<h3 id="discussion-52">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-53">Crosslinks</h3>
+<h3 id="crosslinks-50">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="genrec">genrec</h2>
@@ -1349,15 +1324,15 @@ a b [G] [E] [L] cmp
   == [I] [T] [R [P] i] ifte
   == [I] [T] [R P] ifte</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-55">Definition</h3>
+<h3 id="definition-53">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-50">Derivation</h3>
+<h3 id="derivation-43">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-49">Source</h3>
+<h3 id="source-42">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-56">Discussion</h3>
+<h3 id="discussion-53">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-54">Crosslinks</h3>
+<h3 id="crosslinks-51">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="getitem">getitem</h2>
@@ -1368,90 +1343,90 @@ a b [G] [E] [L] cmp
 -------------------------
  a</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-56">Definition</h3>
+<h3 id="definition-54">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-51">Derivation</h3>
+<h3 id="derivation-44">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-50">Source</h3>
+<h3 id="source-43">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-57">Discussion</h3>
+<h3 id="discussion-54">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-55">Crosslinks</h3>
+<h3 id="crosslinks-52">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="grabn">grabN</h2>
 <p>Basis Function Combinator</p>
 <p>&lt;{} [cons] times</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-57">Definition</h3>
+<h3 id="definition-55">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-52">Derivation</h3>
+<h3 id="derivation-45">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-51">Source</h3>
+<h3 id="source-44">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-58">Discussion</h3>
+<h3 id="discussion-55">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-56">Crosslinks</h3>
+<h3 id="crosslinks-53">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="grba">grba</h2>
 <p>Basis Function Combinator</p>
 <p>[stack popd] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-58">Definition</h3>
+<h3 id="definition-56">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-53">Derivation</h3>
+<h3 id="derivation-46">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-52">Source</h3>
+<h3 id="source-45">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-59">Discussion</h3>
+<h3 id="discussion-56">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-57">Crosslinks</h3>
+<h3 id="crosslinks-54">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="gt">gt</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &gt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-59">Definition</h3>
+<h3 id="definition-57">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-54">Derivation</h3>
+<h3 id="derivation-47">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-53">Source</h3>
+<h3 id="source-46">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-60">Discussion</h3>
+<h3 id="discussion-57">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-58">Crosslinks</h3>
+<h3 id="crosslinks-55">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="help">help</h2>
 <p>Basis Function Combinator</p>
 <p>Accepts a quoted symbol on the top of the stack and prints its docs.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-60">Definition</h3>
+<h3 id="definition-58">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-55">Derivation</h3>
+<h3 id="derivation-48">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-54">Source</h3>
+<h3 id="source-47">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-61">Discussion</h3>
+<h3 id="discussion-58">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-59">Crosslinks</h3>
+<h3 id="crosslinks-56">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="hypot">hypot</h2>
 <p>Basis Function Combinator</p>
 <p>[sqr] ii + sqrt</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-61">Definition</h3>
+<h3 id="definition-59">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-56">Derivation</h3>
+<h3 id="derivation-49">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-55">Source</h3>
+<h3 id="source-48">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-62">Discussion</h3>
+<h3 id="discussion-59">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-60">Crosslinks</h3>
+<h3 id="crosslinks-57">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="i">i</h2>
@@ -1460,24 +1435,24 @@ a b [G] [E] [L] cmp
 <pre><code>   [Q] i
 -----------
     Q</code></pre>
-<h3 id="source-56">Source</h3>
+<h3 id="source-49">Source</h3>
 <pre><code>combo(i, [list(P)|S], S, Ei, Eo) :- append(P, Ei, Eo).</code></pre>
-<h3 id="discussion-63">Discussion</h3>
+<h3 id="discussion-60">Discussion</h3>
 <p>This is probably the fundamental combinator. You wind up using it in all kinds of places (for example, the <code>x</code> combinator can be defined as <code>dup i</code>.)</p>
 <hr />
 <h2 id="id">id</h2>
 <p>Basis Function Combinator</p>
 <p>The identity function.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-62">Definition</h3>
+<h3 id="definition-60">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-57">Derivation</h3>
+<h3 id="derivation-50">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-57">Source</h3>
+<h3 id="source-50">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-64">Discussion</h3>
+<h3 id="discussion-61">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-61">Crosslinks</h3>
+<h3 id="crosslinks-58">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ifte">ifte</h2>
@@ -1495,15 +1470,15 @@ a b [G] [E] [L] cmp
 ... [else] [then] [...] [if] infra first choice i</code></pre>
 <p>Has the effect of grabbing a copy of the stack on which to run the if-part using infra.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-63">Definition</h3>
+<h3 id="definition-61">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-58">Derivation</h3>
+<h3 id="derivation-51">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-58">Source</h3>
+<h3 id="source-51">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-65">Discussion</h3>
+<h3 id="discussion-62">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-62">Crosslinks</h3>
+<h3 id="crosslinks-59">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ii">ii</h2>
@@ -1512,15 +1487,15 @@ a b [G] [E] [L] cmp
 ------------------
  ... Q a Q</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-64">Definition</h3>
+<h3 id="definition-62">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-59">Derivation</h3>
+<h3 id="derivation-52">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-59">Source</h3>
+<h3 id="source-52">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-66">Discussion</h3>
+<h3 id="discussion-63">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-63">Crosslinks</h3>
+<h3 id="crosslinks-60">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="infra">infra</h2>
@@ -1529,26 +1504,26 @@ a b [G] [E] [L] cmp
 <pre><code>   ... [a b c] [Q] infra
 ---------------------------
     c b a Q [...] swaack</code></pre>
-<h3 id="definition-65">Definition</h3>
+<h3 id="definition-63">Definition</h3>
 <pre><code>swons swaack [i] dip swaack</code></pre>
-<h3 id="discussion-67">Discussion</h3>
+<h3 id="discussion-64">Discussion</h3>
 <p>This is one of the more useful combinators. It allows a quoted expression to serve as a stack for a program, effectively running it in a kind of &#x201C;pocket universe&#x201D;. If the list represents a datastructure then <code>infra</code> lets you work on its internal structure.</p>
-<h3 id="crosslinks-64">Crosslinks</h3>
+<h3 id="crosslinks-61">Crosslinks</h3>
 <p><a href="#swaack">swaack</a></p>
 <hr />
 <h2 id="infrst">infrst</h2>
 <p>Basis Function Combinator</p>
 <p>infra first</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-66">Definition</h3>
+<h3 id="definition-64">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-60">Derivation</h3>
+<h3 id="derivation-53">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-60">Source</h3>
+<h3 id="source-53">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-68">Discussion</h3>
+<h3 id="discussion-65">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-65">Crosslinks</h3>
+<h3 id="crosslinks-62">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="inscribe">inscribe</h2>
@@ -1558,30 +1533,30 @@ a b [G] [E] [L] cmp
 <p>[sqr dup mul] inscribe</p>
 </blockquote>
 <p>Gentzen diagram.</p>
-<h3 id="definition-67">Definition</h3>
+<h3 id="definition-65">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-61">Derivation</h3>
+<h3 id="derivation-54">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-61">Source</h3>
+<h3 id="source-54">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-69">Discussion</h3>
+<h3 id="discussion-66">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-66">Crosslinks</h3>
+<h3 id="crosslinks-63">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="le">le</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &lt;= b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-68">Definition</h3>
+<h3 id="definition-66">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-62">Derivation</h3>
+<h3 id="derivation-55">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-62">Source</h3>
+<h3 id="source-55">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-70">Discussion</h3>
+<h3 id="discussion-67">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-67">Crosslinks</h3>
+<h3 id="crosslinks-64">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="loop">loop</h2>
@@ -1595,120 +1570,120 @@ a b [G] [E] [L] cmp
 ------------------------
    ...</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-69">Definition</h3>
+<h3 id="definition-67">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-63">Derivation</h3>
+<h3 id="derivation-56">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-63">Source</h3>
+<h3 id="source-56">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-71">Discussion</h3>
+<h3 id="discussion-68">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-68">Crosslinks</h3>
+<h3 id="crosslinks-65">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="lshift">lshift</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &lt;&lt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-70">Definition</h3>
+<h3 id="definition-68">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-64">Derivation</h3>
+<h3 id="derivation-57">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-64">Source</h3>
+<h3 id="source-57">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-72">Discussion</h3>
+<h3 id="discussion-69">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-69">Crosslinks</h3>
+<h3 id="crosslinks-66">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="lt">lt</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &lt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-71">Definition</h3>
+<h3 id="definition-69">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-65">Derivation</h3>
+<h3 id="derivation-58">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-65">Source</h3>
+<h3 id="source-58">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-73">Discussion</h3>
+<h3 id="discussion-70">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-70">Crosslinks</h3>
+<h3 id="crosslinks-67">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="make_generator">make_generator</h2>
 <p>Basis Function Combinator</p>
 <p>[codireco] ccons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-72">Definition</h3>
+<h3 id="definition-70">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-66">Derivation</h3>
+<h3 id="derivation-59">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-66">Source</h3>
+<h3 id="source-59">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-74">Discussion</h3>
+<h3 id="discussion-71">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-71">Crosslinks</h3>
+<h3 id="crosslinks-68">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="map">map</h2>
 <p>Basis Function Combinator</p>
 <p>Run the quoted program on TOS on the items in the list under it, push a new list with the results in place of the program and original list.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-73">Definition</h3>
+<h3 id="definition-71">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-67">Derivation</h3>
+<h3 id="derivation-60">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-67">Source</h3>
+<h3 id="source-60">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-75">Discussion</h3>
+<h3 id="discussion-72">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-72">Crosslinks</h3>
+<h3 id="crosslinks-69">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="max">max</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list find the maximum.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-74">Definition</h3>
+<h3 id="definition-72">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-68">Derivation</h3>
+<h3 id="derivation-61">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-68">Source</h3>
+<h3 id="source-61">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-76">Discussion</h3>
+<h3 id="discussion-73">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-73">Crosslinks</h3>
+<h3 id="crosslinks-70">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="min">min</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list find the minimum.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-75">Definition</h3>
+<h3 id="definition-73">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-69">Derivation</h3>
+<h3 id="derivation-62">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-69">Source</h3>
+<h3 id="source-62">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-77">Discussion</h3>
+<h3 id="discussion-74">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-74">Crosslinks</h3>
+<h3 id="crosslinks-71">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="mod">mod</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a % b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-76">Definition</h3>
+<h3 id="definition-74">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-70">Derivation</h3>
+<h3 id="derivation-63">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-70">Source</h3>
+<h3 id="source-63">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-78">Discussion</h3>
+<h3 id="discussion-75">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-75">Crosslinks</h3>
+<h3 id="crosslinks-72">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="modulus">modulus</h2>
@@ -1718,60 +1693,60 @@ a b [G] [E] [L] cmp
 <p>Basis Function Combinator</p>
 <p>Same as a * b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-77">Definition</h3>
+<h3 id="definition-75">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-71">Derivation</h3>
+<h3 id="derivation-64">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-71">Source</h3>
+<h3 id="source-64">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-79">Discussion</h3>
+<h3 id="discussion-76">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-76">Crosslinks</h3>
+<h3 id="crosslinks-73">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ne">ne</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a != b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-78">Definition</h3>
+<h3 id="definition-76">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-72">Derivation</h3>
+<h3 id="derivation-65">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-72">Source</h3>
+<h3 id="source-65">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-80">Discussion</h3>
+<h3 id="discussion-77">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-77">Crosslinks</h3>
+<h3 id="crosslinks-74">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="neg">neg</h2>
 <p>Basis Function Combinator</p>
 <p>Same as -a.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-79">Definition</h3>
+<h3 id="definition-77">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-73">Derivation</h3>
+<h3 id="derivation-66">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-73">Source</h3>
+<h3 id="source-66">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-81">Discussion</h3>
+<h3 id="discussion-78">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-78">Crosslinks</h3>
+<h3 id="crosslinks-75">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="not">not</h2>
 <p>Basis Function Combinator</p>
 <p>Same as not a.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-80">Definition</h3>
+<h3 id="definition-78">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-74">Derivation</h3>
+<h3 id="derivation-67">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-74">Source</h3>
+<h3 id="source-67">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-82">Discussion</h3>
+<h3 id="discussion-79">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-79">Crosslinks</h3>
+<h3 id="crosslinks-76">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="section-26">!-</h2>
@@ -1785,22 +1760,22 @@ a b [G] [E] [L] cmp
    N !-
 ----------  N &gt;= 0
    true</code></pre>
-<h3 id="definition-81">Definition</h3>
+<h3 id="definition-79">Definition</h3>
 <pre><code>0 &gt;=</code></pre>
 <hr />
 <h2 id="nulco">nulco</h2>
 <p>Basis Function Combinator</p>
 <p>[nullary] cons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-82">Definition</h3>
+<h3 id="definition-80">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-75">Derivation</h3>
+<h3 id="derivation-68">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-75">Source</h3>
+<h3 id="source-68">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-83">Discussion</h3>
+<h3 id="discussion-80">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-80">Crosslinks</h3>
+<h3 id="crosslinks-77">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="nullary">nullary</h2>
@@ -1809,78 +1784,78 @@ a b [G] [E] [L] cmp
 <pre><code>   ... [P] nullary
 ---------------------
         ... A</code></pre>
-<h3 id="definition-83">Definition</h3>
+<h3 id="definition-81">Definition</h3>
 <pre><code>[stack] dip infra first</code></pre>
-<h3 id="derivation-76">Derivation</h3>
+<h3 id="derivation-69">Derivation</h3>
 <pre><code>... [P] nullary
 ... [P] [stack] dip infra first
 ... stack [P] infra first
 ... [...] [P] infra first
 ... [A ...] first
 ...  A</code></pre>
-<h3 id="discussion-84">Discussion</h3>
+<h3 id="discussion-81">Discussion</h3>
 <p>A very useful function that runs any other quoted function and returns it&#x2019;s first result without disturbing the stack (under the quoted program.)</p>
-<h3 id="crosslinks-81">Crosslinks</h3>
+<h3 id="crosslinks-78">Crosslinks</h3>
 <p><a href="#unary">unary</a> <a href="#binary">binary</a> <a href="#ternary">ternary</a></p>
 <hr />
 <h2 id="of">of</h2>
 <p>Basis Function Combinator</p>
 <p>swap at</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-84">Definition</h3>
+<h3 id="definition-82">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-77">Derivation</h3>
+<h3 id="derivation-70">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-76">Source</h3>
+<h3 id="source-69">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-85">Discussion</h3>
+<h3 id="discussion-82">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-82">Crosslinks</h3>
+<h3 id="crosslinks-79">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="or">or</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a | b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-85">Definition</h3>
+<h3 id="definition-83">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-78">Derivation</h3>
+<h3 id="derivation-71">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-77">Source</h3>
+<h3 id="source-70">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-86">Discussion</h3>
+<h3 id="discussion-83">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-83">Crosslinks</h3>
+<h3 id="crosslinks-80">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="over">over</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a2 a1 a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-86">Definition</h3>
+<h3 id="definition-84">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-79">Derivation</h3>
+<h3 id="derivation-72">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-78">Source</h3>
+<h3 id="source-71">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-87">Discussion</h3>
+<h3 id="discussion-84">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-84">Crosslinks</h3>
+<h3 id="crosslinks-81">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pam">pam</h2>
 <p>Basis Function Combinator</p>
 <p>[i] map</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-87">Definition</h3>
+<h3 id="definition-85">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-80">Derivation</h3>
+<h3 id="derivation-73">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-79">Source</h3>
+<h3 id="source-72">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-88">Discussion</h3>
+<h3 id="discussion-85">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-85">Crosslinks</h3>
+<h3 id="crosslinks-82">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pick">pick</h2>
@@ -1893,150 +1868,150 @@ a b [G] [E] [L] cmp
 -------------
 a+b a-b</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-88">Definition</h3>
+<h3 id="definition-86">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-81">Derivation</h3>
+<h3 id="derivation-74">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-80">Source</h3>
+<h3 id="source-73">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-89">Discussion</h3>
+<h3 id="discussion-86">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-86">Crosslinks</h3>
+<h3 id="crosslinks-83">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pop">pop</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 --)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-89">Definition</h3>
+<h3 id="definition-87">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-82">Derivation</h3>
+<h3 id="derivation-75">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-81">Source</h3>
+<h3 id="source-74">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-90">Discussion</h3>
+<h3 id="discussion-87">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-87">Crosslinks</h3>
+<h3 id="crosslinks-84">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popd">popd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-90">Definition</h3>
+<h3 id="definition-88">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-83">Derivation</h3>
+<h3 id="derivation-76">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-82">Source</h3>
+<h3 id="source-75">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-91">Discussion</h3>
+<h3 id="discussion-88">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-88">Crosslinks</h3>
+<h3 id="crosslinks-85">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popdd">popdd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a3 a2 a1 -- a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-91">Definition</h3>
+<h3 id="definition-89">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-84">Derivation</h3>
+<h3 id="derivation-77">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-83">Source</h3>
+<h3 id="source-76">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-92">Discussion</h3>
+<h3 id="discussion-89">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-89">Crosslinks</h3>
+<h3 id="crosslinks-86">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popop">popop</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 --)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-92">Definition</h3>
+<h3 id="definition-90">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-85">Derivation</h3>
+<h3 id="derivation-78">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-84">Source</h3>
+<h3 id="source-77">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-93">Discussion</h3>
+<h3 id="discussion-90">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-90">Crosslinks</h3>
+<h3 id="crosslinks-87">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popopd">popopd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a3 a2 a1 -- a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-93">Definition</h3>
+<h3 id="definition-91">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-86">Derivation</h3>
+<h3 id="derivation-79">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-85">Source</h3>
+<h3 id="source-78">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-94">Discussion</h3>
+<h3 id="discussion-91">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-91">Crosslinks</h3>
+<h3 id="crosslinks-88">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popopdd">popopdd</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a4 a3 a2 a1 -- a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-94">Definition</h3>
+<h3 id="definition-92">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-87">Derivation</h3>
+<h3 id="derivation-80">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-86">Source</h3>
+<h3 id="source-79">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-95">Discussion</h3>
+<h3 id="discussion-92">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-92">Crosslinks</h3>
+<h3 id="crosslinks-89">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="popopop">popopop</h2>
 <p>Basis Function Combinator</p>
 <p>pop popop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-95">Definition</h3>
+<h3 id="definition-93">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-88">Derivation</h3>
+<h3 id="derivation-81">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-87">Source</h3>
+<h3 id="source-80">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-96">Discussion</h3>
+<h3 id="discussion-93">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-93">Crosslinks</h3>
+<h3 id="crosslinks-90">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pow">pow</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a ** b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-96">Definition</h3>
+<h3 id="definition-94">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-89">Derivation</h3>
+<h3 id="derivation-82">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-88">Source</h3>
+<h3 id="source-81">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-97">Discussion</h3>
+<h3 id="discussion-94">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-94">Crosslinks</h3>
+<h3 id="crosslinks-91">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="pred">pred</h2>
 <p>Basis Function Combinator</p>
 <p>Decrement TOS.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-97">Definition</h3>
+<h3 id="definition-95">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-90">Derivation</h3>
+<h3 id="derivation-83">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-89">Source</h3>
+<h3 id="source-82">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-98">Discussion</h3>
+<h3 id="discussion-95">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-95">Crosslinks</h3>
+<h3 id="crosslinks-92">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="primrec">primrec</h2>
@@ -2055,90 +2030,90 @@ a+b a-b</code></pre>
 ------------------------------------------ n &gt; 0
    n (n-1) [Base] [Recur] primrec Recur</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-98">Definition</h3>
+<h3 id="definition-96">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-91">Derivation</h3>
+<h3 id="derivation-84">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-90">Source</h3>
+<h3 id="source-83">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-99">Discussion</h3>
+<h3 id="discussion-96">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-96">Crosslinks</h3>
+<h3 id="crosslinks-93">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="product">product</h2>
 <p>Basis Function Combinator</p>
 <p>1 swap [*] step</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-99">Definition</h3>
+<h3 id="definition-97">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-92">Derivation</h3>
+<h3 id="derivation-85">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-91">Source</h3>
+<h3 id="source-84">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-100">Discussion</h3>
+<h3 id="discussion-97">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-97">Crosslinks</h3>
+<h3 id="crosslinks-94">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="quoted">quoted</h2>
 <p>Basis Function Combinator</p>
 <p>[unit] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-100">Definition</h3>
+<h3 id="definition-98">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-93">Derivation</h3>
+<h3 id="derivation-86">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-92">Source</h3>
+<h3 id="source-85">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-101">Discussion</h3>
+<h3 id="discussion-98">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-98">Crosslinks</h3>
+<h3 id="crosslinks-95">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="range">range</h2>
 <p>Basis Function Combinator</p>
 <p>[0 &lt;=] [1 - dup] anamorphism</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-101">Definition</h3>
+<h3 id="definition-99">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-94">Derivation</h3>
+<h3 id="derivation-87">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-93">Source</h3>
+<h3 id="source-86">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-102">Discussion</h3>
+<h3 id="discussion-99">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-99">Crosslinks</h3>
+<h3 id="crosslinks-96">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="range_to_zero">range_to_zero</h2>
 <p>Basis Function Combinator</p>
 <p>unit [down_to_zero] infra</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-102">Definition</h3>
+<h3 id="definition-100">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-95">Derivation</h3>
+<h3 id="derivation-88">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-94">Source</h3>
+<h3 id="source-87">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-103">Discussion</h3>
+<h3 id="discussion-100">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-100">Crosslinks</h3>
+<h3 id="crosslinks-97">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="reco">reco</h2>
 <p>Basis Function Combinator</p>
 <p>rest cons</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-103">Definition</h3>
+<h3 id="definition-101">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-96">Derivation</h3>
+<h3 id="derivation-89">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-95">Source</h3>
+<h3 id="source-88">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-104">Discussion</h3>
+<h3 id="discussion-101">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-101">Crosslinks</h3>
+<h3 id="crosslinks-98">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rem">rem</h2>
@@ -2154,30 +2129,30 @@ a+b a-b</code></pre>
 ------------------------
   [2 3 1]</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-104">Definition</h3>
+<h3 id="definition-102">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-97">Derivation</h3>
+<h3 id="derivation-90">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-96">Source</h3>
+<h3 id="source-89">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-105">Discussion</h3>
+<h3 id="discussion-102">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-102">Crosslinks</h3>
+<h3 id="crosslinks-99">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rest">rest</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 ...0] -- [...0])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-105">Definition</h3>
+<h3 id="definition-103">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-98">Derivation</h3>
+<h3 id="derivation-91">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-97">Source</h3>
+<h3 id="source-90">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-106">Discussion</h3>
+<h3 id="discussion-103">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-103">Crosslinks</h3>
+<h3 id="crosslinks-100">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="reverse">reverse</h2>
@@ -2185,45 +2160,45 @@ a+b a-b</code></pre>
 <p>Reverse the list on the top of the stack. :</p>
 <pre><code>reverse == [] swap shunt</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-106">Definition</h3>
+<h3 id="definition-104">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-99">Derivation</h3>
+<h3 id="derivation-92">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-98">Source</h3>
+<h3 id="source-91">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-107">Discussion</h3>
+<h3 id="discussion-104">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-104">Crosslinks</h3>
+<h3 id="crosslinks-101">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rolldown">rolldown</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 a2 a3 -- a2 a3 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-107">Definition</h3>
+<h3 id="definition-105">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-100">Derivation</h3>
+<h3 id="derivation-93">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-99">Source</h3>
+<h3 id="source-92">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-108">Discussion</h3>
+<h3 id="discussion-105">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-105">Crosslinks</h3>
+<h3 id="crosslinks-102">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rollup">rollup</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 a2 a3 -- a3 a1 a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-108">Definition</h3>
+<h3 id="definition-106">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-101">Derivation</h3>
+<h3 id="derivation-94">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-100">Source</h3>
+<h3 id="source-93">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-109">Discussion</h3>
+<h3 id="discussion-106">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-106">Crosslinks</h3>
+<h3 id="crosslinks-103">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="roll">roll&gt;</h2>
@@ -2237,75 +2212,75 @@ a+b a-b</code></pre>
 <p>Round a number to a given precision in decimal digits.</p>
 <p>The return value is an integer if ndigits is omitted or None. Otherwise the return value has the same type as the number. ndigits may be negative.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-109">Definition</h3>
+<h3 id="definition-107">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-102">Derivation</h3>
+<h3 id="derivation-95">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-101">Source</h3>
+<h3 id="source-94">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-110">Discussion</h3>
+<h3 id="discussion-107">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-107">Crosslinks</h3>
+<h3 id="crosslinks-104">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rrest">rrest</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 ...1] -- [...1])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-110">Definition</h3>
+<h3 id="definition-108">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-103">Derivation</h3>
+<h3 id="derivation-96">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-102">Source</h3>
+<h3 id="source-95">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-111">Discussion</h3>
+<h3 id="discussion-108">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-108">Crosslinks</h3>
+<h3 id="crosslinks-105">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="rshift">rshift</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a &gt;&gt; b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-111">Definition</h3>
+<h3 id="definition-109">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-104">Derivation</h3>
+<h3 id="derivation-97">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-103">Source</h3>
+<h3 id="source-96">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-112">Discussion</h3>
+<h3 id="discussion-109">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-109">Crosslinks</h3>
+<h3 id="crosslinks-106">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="run">run</h2>
 <p>Basis Function Combinator</p>
 <p>&lt;{} infra</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-112">Definition</h3>
+<h3 id="definition-110">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-105">Derivation</h3>
+<h3 id="derivation-98">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-104">Source</h3>
+<h3 id="source-97">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-113">Discussion</h3>
+<h3 id="discussion-110">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-110">Crosslinks</h3>
+<h3 id="crosslinks-107">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="second">second</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 ...1] -- a2)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-113">Definition</h3>
+<h3 id="definition-111">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-106">Derivation</h3>
+<h3 id="derivation-99">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-105">Source</h3>
+<h3 id="source-98">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-114">Discussion</h3>
+<h3 id="discussion-111">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-111">Crosslinks</h3>
+<h3 id="crosslinks-108">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="select">select</h2>
@@ -2321,45 +2296,45 @@ a+b a-b</code></pre>
    B</code></pre>
 <p>The sequence can contain more than two items but not fewer. Currently Python semantics are used to evaluate the "truthiness" of the Boolean value (so empty string, zero, etc. are counted as false, etc.)</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-114">Definition</h3>
+<h3 id="definition-112">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-107">Derivation</h3>
+<h3 id="derivation-100">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-106">Source</h3>
+<h3 id="source-99">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-115">Discussion</h3>
+<h3 id="discussion-112">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-112">Crosslinks</h3>
+<h3 id="crosslinks-109">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sharing">sharing</h2>
 <p>Basis Function Combinator</p>
 <p>Print redistribution information.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-115">Definition</h3>
+<h3 id="definition-113">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-108">Derivation</h3>
+<h3 id="derivation-101">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-107">Source</h3>
+<h3 id="source-100">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-116">Discussion</h3>
+<h3 id="discussion-113">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-113">Crosslinks</h3>
+<h3 id="crosslinks-110">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="shift">shift</h2>
 <p>Basis Function Combinator</p>
 <p>uncons [swons] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-116">Definition</h3>
+<h3 id="definition-114">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-109">Derivation</h3>
+<h3 id="derivation-102">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-108">Source</h3>
+<h3 id="source-101">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-117">Discussion</h3>
+<h3 id="discussion-114">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-114">Crosslinks</h3>
+<h3 id="crosslinks-111">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="shunt">shunt</h2>
@@ -2371,150 +2346,150 @@ a+b a-b</code></pre>
 ---------------------------
        [f e d a b c] </code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-117">Definition</h3>
+<h3 id="definition-115">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-110">Derivation</h3>
+<h3 id="derivation-103">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-109">Source</h3>
+<h3 id="source-102">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-118">Discussion</h3>
+<h3 id="discussion-115">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-115">Crosslinks</h3>
+<h3 id="crosslinks-112">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="size">size</h2>
 <p>Basis Function Combinator</p>
 <p>[pop ++] step_zero</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-118">Definition</h3>
+<h3 id="definition-116">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-111">Derivation</h3>
+<h3 id="derivation-104">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-110">Source</h3>
+<h3 id="source-103">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-119">Discussion</h3>
+<h3 id="discussion-116">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-116">Crosslinks</h3>
+<h3 id="crosslinks-113">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sort">sort</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list return it sorted.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-119">Definition</h3>
+<h3 id="definition-117">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-112">Derivation</h3>
+<h3 id="derivation-105">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-111">Source</h3>
+<h3 id="source-104">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-120">Discussion</h3>
+<h3 id="discussion-117">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-117">Crosslinks</h3>
+<h3 id="crosslinks-114">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="spiral_next">spiral_next</h2>
 <p>Basis Function Combinator</p>
 <p>[[[abs] ii &lt;=] [[&lt;&gt;] [pop !-] ||] &amp;&amp;] [[!-] [[++]] [[--]] ifte dip] [[pop !-] [--] [++] ifte] ifte</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-120">Definition</h3>
+<h3 id="definition-118">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-113">Derivation</h3>
+<h3 id="derivation-106">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-112">Source</h3>
+<h3 id="source-105">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-121">Discussion</h3>
+<h3 id="discussion-118">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-118">Crosslinks</h3>
+<h3 id="crosslinks-115">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="split_at">split_at</h2>
 <p>Basis Function Combinator</p>
 <p>[drop] [take] clop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-121">Definition</h3>
+<h3 id="definition-119">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-114">Derivation</h3>
+<h3 id="derivation-107">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-113">Source</h3>
+<h3 id="source-106">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-122">Discussion</h3>
+<h3 id="discussion-119">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-119">Crosslinks</h3>
+<h3 id="crosslinks-116">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="split_list">split_list</h2>
 <p>Basis Function Combinator</p>
 <p>[take reverse] [drop] clop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-122">Definition</h3>
+<h3 id="definition-120">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-115">Derivation</h3>
+<h3 id="derivation-108">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-114">Source</h3>
+<h3 id="source-107">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-123">Discussion</h3>
+<h3 id="discussion-120">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-120">Crosslinks</h3>
+<h3 id="crosslinks-117">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sqr">sqr</h2>
 <p>Basis Function Combinator</p>
 <p>dup *</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-123">Definition</h3>
+<h3 id="definition-121">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-116">Derivation</h3>
+<h3 id="derivation-109">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-115">Source</h3>
+<h3 id="source-108">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-124">Discussion</h3>
+<h3 id="discussion-121">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-121">Crosslinks</h3>
+<h3 id="crosslinks-118">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sqrt">sqrt</h2>
 <p>Basis Function Combinator</p>
 <p>Return the square root of the number a. Negative numbers return complex roots.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-124">Definition</h3>
+<h3 id="definition-122">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-117">Derivation</h3>
+<h3 id="derivation-110">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-116">Source</h3>
+<h3 id="source-109">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-125">Discussion</h3>
+<h3 id="discussion-122">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-122">Crosslinks</h3>
+<h3 id="crosslinks-119">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stack">stack</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(... -- ... [...])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-125">Definition</h3>
+<h3 id="definition-123">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-118">Derivation</h3>
+<h3 id="derivation-111">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-117">Source</h3>
+<h3 id="source-110">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-126">Discussion</h3>
+<h3 id="discussion-123">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-123">Crosslinks</h3>
+<h3 id="crosslinks-120">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stackd">stackd</h2>
 <p>Basis Function Combinator</p>
 <p>[stack] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-126">Definition</h3>
+<h3 id="definition-124">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-119">Derivation</h3>
+<h3 id="derivation-112">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-118">Source</h3>
+<h3 id="source-111">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-127">Discussion</h3>
+<h3 id="discussion-124">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-124">Crosslinks</h3>
+<h3 id="crosslinks-121">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="step">step</h2>
@@ -2535,90 +2510,90 @@ a+b a-b</code></pre>
       ... a . Q [b c] [Q] step</code></pre>
 <p>The step combinator executes the quotation on each member of the list on top of the stack.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-127">Definition</h3>
+<h3 id="definition-125">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-120">Derivation</h3>
+<h3 id="derivation-113">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-119">Source</h3>
+<h3 id="source-112">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-128">Discussion</h3>
+<h3 id="discussion-125">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-125">Crosslinks</h3>
+<h3 id="crosslinks-122">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="step_zero">step_zero</h2>
 <p>Basis Function Combinator</p>
 <p>0 roll&gt; step</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-128">Definition</h3>
+<h3 id="definition-126">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-121">Derivation</h3>
+<h3 id="derivation-114">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-120">Source</h3>
+<h3 id="source-113">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-129">Discussion</h3>
+<h3 id="discussion-126">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-126">Crosslinks</h3>
+<h3 id="crosslinks-123">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stuncons">stuncons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(... a1 -- ... a1 a1 [...])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-129">Definition</h3>
+<h3 id="definition-127">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-122">Derivation</h3>
+<h3 id="derivation-115">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-121">Source</h3>
+<h3 id="source-114">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-130">Discussion</h3>
+<h3 id="discussion-127">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-127">Crosslinks</h3>
+<h3 id="crosslinks-124">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="stununcons">stununcons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(... a2 a1 -- ... a2 a1 a1 a2 [...])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-130">Definition</h3>
+<h3 id="definition-128">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-123">Derivation</h3>
+<h3 id="derivation-116">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-122">Source</h3>
+<h3 id="source-115">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-131">Discussion</h3>
+<h3 id="discussion-128">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-128">Crosslinks</h3>
+<h3 id="crosslinks-125">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sub">sub</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a - b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-131">Definition</h3>
+<h3 id="definition-129">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-124">Derivation</h3>
+<h3 id="derivation-117">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-123">Source</h3>
+<h3 id="source-116">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-132">Discussion</h3>
+<h3 id="discussion-129">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-129">Crosslinks</h3>
+<h3 id="crosslinks-126">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="succ">succ</h2>
 <p>Basis Function Combinator</p>
 <p>Increment TOS.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-132">Definition</h3>
+<h3 id="definition-130">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-125">Derivation</h3>
+<h3 id="derivation-118">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-124">Source</h3>
+<h3 id="source-117">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-133">Discussion</h3>
+<h3 id="discussion-130">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-130">Crosslinks</h3>
+<h3 id="crosslinks-127">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="sum">sum</h2>
@@ -2626,105 +2601,105 @@ a+b a-b</code></pre>
 <p>Given a quoted sequence of numbers return the sum. :</p>
 <pre><code>sum == 0 swap [+] step</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-133">Definition</h3>
+<h3 id="definition-131">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-126">Derivation</h3>
+<h3 id="derivation-119">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-125">Source</h3>
+<h3 id="source-118">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-134">Discussion</h3>
+<h3 id="discussion-131">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-131">Crosslinks</h3>
+<h3 id="crosslinks-128">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swaack">swaack</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([...1] -- [...0])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-134">Definition</h3>
+<h3 id="definition-132">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-127">Derivation</h3>
+<h3 id="derivation-120">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-126">Source</h3>
+<h3 id="source-119">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-135">Discussion</h3>
+<h3 id="discussion-132">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-132">Crosslinks</h3>
+<h3 id="crosslinks-129">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swap">swap</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 a2 -- a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-135">Definition</h3>
+<h3 id="definition-133">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-128">Derivation</h3>
+<h3 id="derivation-121">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-127">Source</h3>
+<h3 id="source-120">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-136">Discussion</h3>
+<h3 id="discussion-133">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-133">Crosslinks</h3>
+<h3 id="crosslinks-130">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swapd">swapd</h2>
 <p>Basis Function Combinator</p>
 <p>[swap] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-136">Definition</h3>
+<h3 id="definition-134">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-129">Derivation</h3>
+<h3 id="derivation-122">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-128">Source</h3>
+<h3 id="source-121">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-137">Discussion</h3>
+<h3 id="discussion-134">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-134">Crosslinks</h3>
+<h3 id="crosslinks-131">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swoncat">swoncat</h2>
 <p>Basis Function Combinator</p>
 <p>swap concat</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-137">Definition</h3>
+<h3 id="definition-135">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-130">Derivation</h3>
+<h3 id="derivation-123">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-129">Source</h3>
+<h3 id="source-122">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-138">Discussion</h3>
+<h3 id="discussion-135">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-135">Crosslinks</h3>
+<h3 id="crosslinks-132">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="swons">swons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([...1] a1 -- [a1 ...1])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-138">Definition</h3>
+<h3 id="definition-136">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-131">Derivation</h3>
+<h3 id="derivation-124">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-130">Source</h3>
+<h3 id="source-123">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-139">Discussion</h3>
+<h3 id="discussion-136">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-136">Crosslinks</h3>
+<h3 id="crosslinks-133">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="tailrec">tailrec</h2>
 <p>Basis Function Combinator</p>
 <p>[i] genrec</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-139">Definition</h3>
+<h3 id="definition-137">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-132">Derivation</h3>
+<h3 id="derivation-125">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-131">Source</h3>
+<h3 id="source-124">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-140">Discussion</h3>
+<h3 id="discussion-137">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-137">Crosslinks</h3>
+<h3 id="crosslinks-134">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="take">take</h2>
@@ -2734,15 +2709,15 @@ a+b a-b</code></pre>
 ----------------------
     [b a]</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-140">Definition</h3>
+<h3 id="definition-138">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-133">Derivation</h3>
+<h3 id="derivation-126">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-132">Source</h3>
+<h3 id="source-125">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-141">Discussion</h3>
+<h3 id="discussion-138">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-138">Crosslinks</h3>
+<h3 id="crosslinks-135">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="ternary">ternary</h2>
@@ -2751,26 +2726,26 @@ a+b a-b</code></pre>
 <pre><code>   ... z y x [P] unary
 -------------------------
          ... A</code></pre>
-<h3 id="definition-141">Definition</h3>
+<h3 id="definition-139">Definition</h3>
 <pre><code>binary popd</code></pre>
-<h3 id="discussion-142">Discussion</h3>
+<h3 id="discussion-139">Discussion</h3>
 <p>Runs any other quoted function and returns its first result while consuming exactly three items from the stack.</p>
-<h3 id="crosslinks-139">Crosslinks</h3>
+<h3 id="crosslinks-136">Crosslinks</h3>
 <p><a href="#binary">binary</a> <a href="#nullary">nullary</a> <a href="#unary">unary</a></p>
 <hr />
 <h2 id="third">third</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 a2 a3 ...1] -- a3)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-142">Definition</h3>
+<h3 id="definition-140">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-134">Derivation</h3>
+<h3 id="derivation-127">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-133">Source</h3>
+<h3 id="source-126">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-143">Discussion</h3>
+<h3 id="discussion-140">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-140">Crosslinks</h3>
+<h3 id="crosslinks-137">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="times">times</h2>
@@ -2790,15 +2765,15 @@ a+b a-b</code></pre>
 -------------------------------------  w/ n &gt; 1
   ... . Q (n - 1) [Q] times</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-143">Definition</h3>
+<h3 id="definition-141">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-135">Derivation</h3>
+<h3 id="derivation-128">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-134">Source</h3>
+<h3 id="source-127">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-144">Discussion</h3>
+<h3 id="discussion-141">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-141">Crosslinks</h3>
+<h3 id="crosslinks-138">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="truthy">truthy</h2>
@@ -2808,15 +2783,15 @@ a+b a-b</code></pre>
 <p>Basis Function Combinator</p>
 <pre><code>(a2 a1 -- a1 a2 a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-144">Definition</h3>
+<h3 id="definition-142">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-136">Derivation</h3>
+<h3 id="derivation-129">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-135">Source</h3>
+<h3 id="source-128">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-145">Discussion</h3>
+<h3 id="discussion-142">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-142">Crosslinks</h3>
+<h3 id="crosslinks-139">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unary">unary</h2>
@@ -2825,11 +2800,11 @@ a+b a-b</code></pre>
 <pre><code>   ... x [P] unary
 ---------------------
        ... A</code></pre>
-<h3 id="definition-145">Definition</h3>
+<h3 id="definition-143">Definition</h3>
 <pre><code>nullary popd</code></pre>
-<h3 id="discussion-146">Discussion</h3>
+<h3 id="discussion-143">Discussion</h3>
 <p>Runs any other quoted function and returns its first result while consuming exactly one item from the stack.</p>
-<h3 id="crosslinks-143">Crosslinks</h3>
+<h3 id="crosslinks-140">Crosslinks</h3>
 <p><a href="#binary">binary</a> <a href="#nullary">nullary</a> <a href="#ternary">ternary</a></p>
 <hr />
 <h2 id="uncons">uncons</h2>
@@ -2838,131 +2813,131 @@ a+b a-b</code></pre>
 <pre><code>   [A ...] uncons
 --------------------
       A [...]</code></pre>
-<h3 id="source-136">Source</h3>
+<h3 id="source-129">Source</h3>
 <pre><code>func(uncons, Si, So) :- func(cons, So, Si).</code></pre>
-<h3 id="discussion-147">Discussion</h3>
+<h3 id="discussion-144">Discussion</h3>
 <p>This is the inverse of <code>cons</code>.</p>
-<h3 id="crosslinks-144">Crosslinks</h3>
+<h3 id="crosslinks-141">Crosslinks</h3>
 <p><a href="#cons">cons</a></p>
 <hr />
 <h2 id="unique">unique</h2>
 <p>Basis Function Combinator</p>
 <p>Given a list remove duplicate items.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-146">Definition</h3>
+<h3 id="definition-144">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-137">Derivation</h3>
+<h3 id="derivation-130">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-137">Source</h3>
+<h3 id="source-130">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-148">Discussion</h3>
+<h3 id="discussion-145">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-145">Crosslinks</h3>
+<h3 id="crosslinks-142">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unit">unit</h2>
 <p>Basis Function Combinator</p>
 <pre><code>(a1 -- [a1 ])</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-147">Definition</h3>
+<h3 id="definition-145">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-138">Derivation</h3>
+<h3 id="derivation-131">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-138">Source</h3>
+<h3 id="source-131">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-149">Discussion</h3>
+<h3 id="discussion-146">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-146">Crosslinks</h3>
+<h3 id="crosslinks-143">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unquoted">unquoted</h2>
 <p>Basis Function Combinator</p>
 <p>[i] dip</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-148">Definition</h3>
+<h3 id="definition-146">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-139">Derivation</h3>
+<h3 id="derivation-132">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-139">Source</h3>
+<h3 id="source-132">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-150">Discussion</h3>
+<h3 id="discussion-147">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-147">Crosslinks</h3>
+<h3 id="crosslinks-144">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="unswons">unswons</h2>
 <p>Basis Function Combinator</p>
 <pre><code>([a1 ...1] -- [...1] a1)</code></pre>
 <p>Gentzen diagram.</p>
-<h3 id="definition-149">Definition</h3>
+<h3 id="definition-147">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-140">Derivation</h3>
+<h3 id="derivation-133">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-140">Source</h3>
+<h3 id="source-133">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-151">Discussion</h3>
+<h3 id="discussion-148">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-148">Crosslinks</h3>
+<h3 id="crosslinks-145">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="void">void</h2>
 <p>Basis Function Combinator</p>
 <p>True if the form on TOS is void otherwise False.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-150">Definition</h3>
+<h3 id="definition-148">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-141">Derivation</h3>
+<h3 id="derivation-134">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-141">Source</h3>
+<h3 id="source-134">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-152">Discussion</h3>
+<h3 id="discussion-149">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-149">Crosslinks</h3>
+<h3 id="crosslinks-146">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="warranty">warranty</h2>
 <p>Basis Function Combinator</p>
 <p>Print warranty information.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-151">Definition</h3>
+<h3 id="definition-149">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-142">Derivation</h3>
+<h3 id="derivation-135">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-142">Source</h3>
+<h3 id="source-135">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-153">Discussion</h3>
+<h3 id="discussion-150">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-150">Crosslinks</h3>
+<h3 id="crosslinks-147">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="while">while</h2>
 <p>Basis Function Combinator</p>
 <p>swap nulco dupdipd concat loop</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-152">Definition</h3>
+<h3 id="definition-150">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-143">Derivation</h3>
+<h3 id="derivation-136">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-143">Source</h3>
+<h3 id="source-136">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-154">Discussion</h3>
+<h3 id="discussion-151">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-151">Crosslinks</h3>
+<h3 id="crosslinks-148">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="words">words</h2>
 <p>Basis Function Combinator</p>
 <p>Print all the words in alphabetical order.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-153">Definition</h3>
+<h3 id="definition-151">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-144">Derivation</h3>
+<h3 id="derivation-137">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-144">Source</h3>
+<h3 id="source-137">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-155">Discussion</h3>
+<h3 id="discussion-152">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-152">Crosslinks</h3>
+<h3 id="crosslinks-149">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="x">x</h2>
@@ -2970,39 +2945,39 @@ a+b a-b</code></pre>
 <pre><code>   [F] x
 -----------
    [F] F</code></pre>
-<h3 id="definition-154">Definition</h3>
+<h3 id="definition-152">Definition</h3>
 <pre><code>dup i</code></pre>
-<h3 id="discussion-156">Discussion</h3>
+<h3 id="discussion-153">Discussion</h3>
 <p>The <code>x</code> combinator &#x2026;</p>
 <hr />
 <h2 id="xor">xor</h2>
 <p>Basis Function Combinator</p>
 <p>Same as a ^ b.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-155">Definition</h3>
+<h3 id="definition-153">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-145">Derivation</h3>
+<h3 id="derivation-138">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-145">Source</h3>
+<h3 id="source-138">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-157">Discussion</h3>
+<h3 id="discussion-154">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-153">Crosslinks</h3>
+<h3 id="crosslinks-150">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 <hr />
 <h2 id="zip">zip</h2>
 <p>Basis Function Combinator</p>
 <p>Replace the two lists on the top of the stack with a list of the pairs from each list. The smallest list sets the length of the result list.</p>
 <p>Gentzen diagram.</p>
-<h3 id="definition-156">Definition</h3>
+<h3 id="definition-154">Definition</h3>
 <p>if not basis.</p>
-<h3 id="derivation-146">Derivation</h3>
+<h3 id="derivation-139">Derivation</h3>
 <p>if not basis.</p>
-<h3 id="source-146">Source</h3>
+<h3 id="source-139">Source</h3>
 <p>if basis</p>
-<h3 id="discussion-158">Discussion</h3>
+<h3 id="discussion-155">Discussion</h3>
 <p>Lorem ipsum.</p>
-<h3 id="crosslinks-154">Crosslinks</h3>
+<h3 id="crosslinks-151">Crosslinks</h3>
 <p>Lorem ipsum.</p>
 </body>
 </html>
diff --git a/docs/reference/mkref/Functor-Reference.md b/docs/reference/mkref/Functor-Reference.md
index 1dad804..8104037 100644
--- a/docs/reference/mkref/Functor-Reference.md
+++ b/docs/reference/mkref/Functor-Reference.md
@@ -175,27 +175,28 @@ See [ne](#ne).
 
 ------------------------------------------------------------------------
 
-## \<{}
+## \<\{\}
 
 Function
 
 
-       ... a \<{}
+       ... a <{}
     ----------------
        ... [] a
 
 
 ### Definition
 
-    \[\] swap
+    [] swap
 
 ### Discussion
 
-Lorem ipsum.
+Tuck an empty list just under the first item on the stack.
 
 ### Crosslinks
 
-Lorem ipsum.
+[<<{}](#section-18)
+
 
 --------------
 
@@ -206,33 +207,29 @@ See [lshift](#lshift).
 
 ------------------------------------------------------------------------
 
-## \<\<{}
+## \<\<\{\}
 
-Basis Function Combinator
+Function
 
-\[\] rollup
 
-Gentzen diagram.
+       ... b a <{}
+    -----------------
+       ... [] b a
+
 
 ### Definition
 
-if not basis.
+    [] rollup
 
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
 
 ### Discussion
 
-Lorem ipsum.
+Tuck an empty list just under the first two items on the stack.
 
 ### Crosslinks
 
-Lorem ipsum.
+[<{}](#section-16)
+
 
 --------------
 
@@ -259,31 +256,23 @@ See [succ](#succ).
 
 ## ?
 
-Basis Function Combinator
+Function
 
-dup bool
-
-Gentzen diagram.
+Is the item on the top of the stack "truthy"?
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> [dup](#dup) [bool](#bool)
 
 ### Discussion
 
-Lorem ipsum.
+You often want to test the truth value of an item on the stack without
+consuming the item.
 
 ### Crosslinks
 
-Lorem ipsum.
+[bool](#bool)
+
 
 --------------
 
@@ -310,147 +299,93 @@ See [floordiv](#floordiv).
 
 ## \|\|
 
-Basis Function Combinator
+Combinator
 
-nulco \[nullary\] dip \[true\] branch
+Short-circuiting Boolean OR
 
-Gentzen diagram.
 
 ### Definition
 
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
+> [nulco](#nulco) \[[nullary](#nullary)\] [dip](#dip) \[true\] [branch](#branch)
 
 ### Discussion
 
-Lorem ipsum.
+Accept two quoted programs, run the first and expect a Boolean value, if
+it’s `false` pop it and run the second program (which should also return a
+Boolean value) otherwise pop the second program (leaving `true` on the
+stack.)
+
+       [A] [B] ||
+    ---------------- A -> false
+            B
+
+
+       [A] [B] ||
+    ---------------- A -> true
+          true
 
 ### Crosslinks
 
-Lorem ipsum.
+[&&](#section-1)
 
 ------------------------------------------------------------------------
 
 ## abs
 
-Basis Function Combinator
+Function
 
 Return the absolute value of the argument.
 
-Gentzen diagram.
-
 ### Definition
 
-if not basis.
+> \[0 <\] \[0 [swap](#swap) -\] \[\] [ifte](#ifte)
 
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
-
-### Crosslinks
-
-Lorem ipsum.
 
 ------------------------------------------------------------------------
 
 ## add
 
-Basis Function Combinator
+Basis Function
 
-Same as a + b.
+Add two numbers together: a + b.
 
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
-
-### Crosslinks
-
-Lorem ipsum.
 
 ------------------------------------------------------------------------
 
 ## anamorphism
 
-Basis Function Combinator
+Combinator
 
-\[pop \[\]\] swap \[dip swons\] genrec
+Build a list of values from a generator program `G` and a stopping
+predicate `P`.
 
-Gentzen diagram.
+               [P] [G] anamorphism
+    -----------------------------------------
+       [P] [pop []] [G] [dip swons] genrec
 
 ### Definition
 
-if not basis.
+> \[[pop](#pop) \[\]\] [swap](#swap) \[[dip](#dip) [swons](#swons)\] [genrec](#genrec)
 
-### Derivation
+### Example
 
-if not basis.
+The `range` function generates a list of the integers from 0 to n - 1:
 
-### Source
-
-if basis
+> \[0 <=\] \[\-\- dup\] anamorphism
 
 ### Discussion
 
-Lorem ipsum.
+See the [Recursion Combinators notebook](https://joypy.osdn.io/notebooks/Recursion_Combinators.html).
 
-### Crosslinks
-
-Lorem ipsum.
 
 ------------------------------------------------------------------------
 
 ## and
 
-Basis Function Combinator
+Basis Function
 
-Same as a & b.
+Logical bit-wise AND.
 
-Gentzen diagram.
-
-### Definition
-
-if not basis.
-
-### Derivation
-
-if not basis.
-
-### Source
-
-if basis
-
-### Discussion
-
-Lorem ipsum.
 
 ### Crosslinks