code: def four_group():
      """
      Return a representation of the Klein four-group as a transitive subgroup
      of S4.
      """
      return PermutationGroup(
          Permutation(0, 1)(2, 3), Permutation(0, 2)(1, 3)
      )
  
imports: from collections import defaultdict
  from enum import Enum
  import itertools
  from sympy.combinatorics.named_groups import SymmetricGroup, AlternatingGroup, CyclicGroup, DihedralGroup, set_symmetric_group_properties, set_alternating_group_properties
  from sympy.combinatorics.perm_groups import PermutationGroup
  from sympy.combinatorics.permutations import Permutation
label_desc: Use image node_id 1 for calling a global function with example usage: four_group() and returns: PermutationGroup