      "    * Yes\n",
      "* Is a single character or number a palindrome?\n",
      "    * No\n",
      "* Can we assume we already have a linked list class that can be used for this problem?\n",
      "    * Yes"
     ]
    },
    {
 
</s> remove     "        iterations_to_compare_half = length // 2\n",
 </s> add     "        iterations = length // 2\n", </s> remove     "        for _ in range(0, iterations_to_compare_half):\n",
 </s> add     "        for _ in range(iterations):\n",
    "    * Yes\n",
    "* Can we use additional data structures?\n",
    "    * Yes\n",
    "* Can we assume this fits in memory?\n",
      "    * Yes\n",
      "* Is a single character or number a palindrome?\n",
      "    * No\n",
      "* Can we assume we already have a linked list class that can be used for this problem?\n",
    "    * Yes\n",
    "* Can we use additional data structures?\n",
    "    * Yes\n",
    "* Can we assume this fits in memory?\n",
      "    * Yes"
     ]
    },
    {
keep keep keep add keep keep keep keep
 Polish linked list palindrome challenge and solution

Update constraints and solution code. 
linked_lists/palindrome/palindrome_challenge.ipynb