code: def inverted_dict_of_lists(d):
      
      new_dict = {}
      for (old_key, old_value_list) in viewitems(dict(d)):
          for new_key in listify(old_value_list):
              new_dict[new_key] = old_key
      return new_dict
docs: Return a dict where the keys are all the values listed in the values of the original dict
  
      >>> inverted_dict_of_lists({0: ['a', 'b'], 1: 'cd'}) == {'a': 0, 'b': 0, 'cd': 1}
      True