  from enum import Enum  # Python 2 users: Run pip install enum34
  
  
  class State(Enum):
      unvisited = 1
      visited = 2
      visiting = 3
  
  
  class Node:
 
</s> remove from collections import OrderedDict
 </s> add  </s> remove     visiting = 3
 </s> add  </s> remove     "    unvisited = 1\n",
 </s> add     "    unvisited = 0\n",
    "    visiting = 1\n", </s> remove     "from collections import OrderedDict\n",
 </s> add  </s> remove     "    visiting = 3\n",
 </s> add 
    unvisited = 0
    visiting = 1
  from enum import Enum  # Python 2 users: Run pip install enum34
  
  
  class State(Enum):
    unvisited = 0
    visiting = 1
      visited = 2
      visiting = 3
  
  
  class Node:
keep keep keep keep replace keep keep keep keep keep
 Rework graph challenge and solution (#86) 
graphs_trees/graph/graph.py