code: def test_simplify_presentation():
      # ref #16083
      G = simplify_presentation(FpGroup(FreeGroup([]), []))
      assert not G.generators
      assert not G.relators
  
file_path: sympy/sympy/combinatorics/tests/test_fp_groups.py
imports: from sympy.core.singleton import S
  from sympy.combinatorics.fp_groups import FpGroup, low_index_subgroups, reidemeister_presentation, FpSubgroup, simplify_presentation
  from sympy.combinatorics.free_groups import free_group, FreeGroup
  from sympy.testing.pytest import slow
label_desc: Use image node_id 6 for calling a global function with example usage: test_simplify_presentation() without return types