      "\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",
    "\n",
    "*Problem statements are often intentionally ambiguous.  Identifying constraints and stating assumptions can help to ensure you code the intended solution.*\n", </s> remove    "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
 </s> add    "cell_type": "markdown",
   "metadata": {}, </s> remove    "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
 </s> add    "cell_type": "markdown",
   "metadata": {}, </s> remove    "outputs": [],
 </s> add    "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Overwriting linked_list.py\n"
     ]
    }
   ],
    "* [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 algorithm discussion, code, and unit test. 
linked-lists/linked-list.ipynb