     "metadata": {},
     "source": [
      "## Test Cases\n",
      "\n",
      "* 5, 3, 8, 2, 4, 1, 7, 6, 9, 10, 11 -> [[5], [3, 8], [2, 4, 7, 9], [1, 6, 10], [11]]"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
 
</s> remove     "* 5, 3, 8, 2, 4, 1, 7, 6, 9, 10, 11 -> [[5], [3, 8], [2, 4, 7, 9], [1, 6, 10], [11]]"
 </s> add     "* 5, 3, 8, 2, 4, 1, 7, 6, 9, 10, 11 -> [[5], [3, 8], [2, 4, 7, 9], [1, 6, 10], [11]]\n",
    "\n",
    "Note: Each number in the result is actually a node containing the number" </s> remove    "pygments_lexer": "ipython2",
   "version": "2.7.10"
 </s> add    "pygments_lexer": "ipython3",
   "version": "3.5.0" </s> remove    "pygments_lexer": "ipython2",
   "version": "2.7.10"
 </s> add    "pygments_lexer": "ipython3",
   "version": "3.5.0" </s> remove    "display_name": "Python 2",
 </s> add    "display_name": "Python 3",
    "* 5, 3, 8, 2, 4, 1, 7, 6, 9, 10, 11 -> [[5], [3, 8], [2, 4, 7, 9], [1, 6, 10], [11]]\n",
    "\n",
    "Note: Each number in the result is actually a node containing the number"
     "metadata": {},
     "source": [
      "## Test Cases\n",
      "\n",
    "* 5, 3, 8, 2, 4, 1, 7, 6, 9, 10, 11 -> [[5], [3, 8], [2, 4, 7, 9], [1, 6, 10], [11]]\n",
    "\n",
    "Note: Each number in the result is actually a node containing the number"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
keep keep keep keep replace keep keep keep keep keep
 Polish tree level lists challenge and solution (#79)

Update constraints and test cases. 
graphs_trees/tree_level_lists/tree_level_lists_challenge.ipynb