      "\n",
      "* [Clarifying Questions](#Clarifying-Questions)\n",
      "* [Test Cases](#Test-Cases)\n",
      "* [Algorithm](#Algorithm)\n",
      "* [Code](#Code)"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
 
</s> remove     "* [Clarifying Questions](#Clarifying-Questions)\n",
 </s> add     "* [Constraints and Assumptions](#Constraints-and-Assumptions)\n", </s> remove     "## Clarifying Questions\n",
 </s> add     "## Constraints and Assumptions\n", </s> remove     "    * No"
 </s> add     "    * No\n",
    "* Can we assume we already have a linked list class that can be used for this problem?\n",
    "    * Yes" </s> remove     "* Check for edge cases above, returning None for errors\n",
 </s> add 
    "* [Code](#Code)\n",
    "* [Unit Test](#Unit-Test)"
      "\n",
      "* [Clarifying Questions](#Clarifying-Questions)\n",
      "* [Test Cases](#Test-Cases)\n",
      "* [Algorithm](#Algorithm)\n",
    "* [Code](#Code)\n",
    "* [Unit Test](#Unit-Test)"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
keep keep keep keep replace keep keep keep keep keep
 Reworked notebook: Added more detail to constraints and test cases.  Reworked code and unit test. 
linked-lists/kth-to-last-elem.ipynb