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      "3"
     ]
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   ],
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    }
   ],
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  },
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   "outputs": [
    {
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      "[\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]]"
     ]
    }
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    "[\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] "
   ]
  },
  {
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   "execution_count": 5,
   "metadata": {},
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    {
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     "output_type": "stream",
     "text": [
      "[\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] [first]"
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    {
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     "output_type": "stream",
     "text": [
      "[\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] [\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] [first]"
     ]
    }
   ],
   "source": [
    "[dup] dip"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] [\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] [not] [pop] [[first] dupdip] [[rest rest] dip step]"
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   },
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    {
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     "output_type": "stream",
     "text": [
      "[\"tommy\" 23 [\"richard\" 48 [] []] [\"jenny\" 18 [] []]] \"tommy\" \"richard\" \"jenny\""
     ]
    }
   ],
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    "genrec"
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