       "output_type": "stream",
       "text": [
        "Success: test_graph\n"
       ]
      }
     ],
     "source": [
 
</s> remove     "from collections import OrderedDict\n",
 </s> add  </s> remove     "    * Yes\n",
 </s> add     "    * Implement both\n", </s> remove     "    * Yes\n",
 </s> add     "    * Implement both\n", </s> remove     "from collections import OrderedDict\n",
    "\n",
    "\n",
 </s> add  </s> remove    "display_name": "Python 2",
 </s> add    "display_name": "Python 3",
      "Success: test_graph\n",
       "output_type": "stream",
       "text": [
      "Success: test_graph\n",
        "Success: test_graph\n"
       ]
      }
     ],
     "source": [
keep add keep keep keep keep keep
 Rework graph challenge and solution (#86) 
graphs_trees/graph/graph_solution.ipynb