{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "7b64e2f7",
   "metadata": {},
   "source": [
    "# Code in Python"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "55341690",
   "metadata": {},
   "outputs": [],
   "source": [
    "def cons(a, b):\n",
    "    return (a,b)\n",
    "\n",
    "def car(pair):\n",
    "    return pair[0]\n",
    "\n",
    "def cdr(pair):\n",
    "    return pair[1]\n",
    "\n",
    "lst = cons(1,cons(2,3))\n",
    "\n",
    "# Get the first element of lst\n",
    "print(car(lst))\n",
    "\n",
    "# Get the second element of lst\n",
    "print(car(cdr(lst)))\n",
    "\n",
    "# Get the last element of lst\n",
    "print(cdr(cdr(lst)))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8dcb330a",
   "metadata": {},
   "source": [
    "# Code in Python"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "40190471",
   "metadata": {},
   "outputs": [],
   "source": [
    "def cons(a, b):\n",
    "    def pair(f):\n",
    "        return f(a, b)\n",
    "    return pair\n",
    "\n",
    "def car(f):\n",
    "    def pair(a,b):\n",
    "        return a\n",
    "    return f(pair)\n",
    "\n",
    "def cdr(f):\n",
    "    def pair(a, b):\n",
    "        return b\n",
    "    return f(pair)\n",
    "\n",
    "print(car(cons(3,4)))\n",
    "\n",
    "print(cdr(cons(3,4)))\n"
   ]
  }
 ],
 "metadata": {},
 "nbformat": 4,
 "nbformat_minor": 5
}