In Elm.

implementations/Elm/.gitignore

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+elm-stuff

implementations/Elm/elm.json

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+{
+    "type": "application",
+    "source-directories": [
+        "src"
+    ],
+    "elm-version": "0.19.1",
+    "dependencies": {
+        "direct": {
+            "elm/browser": "1.0.2",
+            "elm/core": "1.0.5",
+            "elm/html": "1.0.0"
+        },
+        "indirect": {
+            "elm/json": "1.1.3",
+            "elm/time": "1.0.0",
+            "elm/url": "1.0.0",
+            "elm/virtual-dom": "1.0.3"
+        }
+    },
+    "test-dependencies": {
+        "direct": {},
+        "indirect": {}
+    }
+}

implementations/Elm/src/Main.elm

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+module Main exposing (..)
+
+
+import Browser
+import Html exposing (Html, Attribute, div, input, text)
+import Html.Attributes exposing (..)
+import Html.Events exposing (onInput)
+
+
+
+-- MAIN
+
+
+main =
+  Browser.sandbox { init = init, update = update, view = view }
+
+
+
+-- MODEL
+
+
+type alias Model =
+  { content : String
+  }
+
+
+init : Model
+init =
+  { content = "" }
+
+
+
+-- UPDATE
+
+
+type Msg
+  = Change String
+
+
+update : Msg -> Model -> Model
+update msg model =
+  case msg of
+    Change newContent ->
+      { model | content = newContent }
+
+
+
+-- VIEW
+
+
+view : Model -> Html Msg
+view model =
+  div []
+    [ input [ placeholder "Text to reverse", value model.content, onInput Change ] []
+    , div [] [ text (String.reverse model.content) ]
+    ]

implementations/Python/README.md

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+This is out of date.  The Python implementation was the original one.
+
 Thun
 
 A Dialect of Joy.