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# groups

groups(many_to_one)

  Converts a many-to-one mapping into a one-to-many mapping.

  `many_to_one` must be a dictionary whose keys and values are all hashable.

  The return value is a dictionary mapping values from `many_to_one` to sets of keys from `many_to_one` that have that value.

  Examples

      >>> from networkx.utils import groups
      >>> many_to_one = {"a": 1, "b": 1, "c": 2, "d": 3, "e": 3}
      >>> groups(many_to_one)
      {1: {'a', 'b'}, 2: {'c'}, 3: {'e', 'd'}}