code: def test_FreeGroupElm_copy():
      f = x * y * z**3
      g = f.copy()
      h = x * y * z**7
  
      assert f == g
      assert f != h
  
imports: from sympy.combinatorics.free_groups import free_group, FreeGroup
  from sympy.core import Symbol
  from sympy.testing.pytest import raises
  from sympy.core.numbers import oo
label_desc: Use image node_id 7 for calling a global function with example usage: test_FreeGroupElm_copy() without return types