code: def test_issue_21399():
      from sympy.abc import a, b, c
  
      assert Max(Min(a, b), Min(a, b, c)) == Min(a, b)
  
imports: import itertools
  from sympy.core.expr import unchanged
  from sympy.core.function import Function
  from sympy.core.numbers import I, oo, Rational
  from sympy.core.power import Pow
  from sympy.core.singleton import S
  from sympy.core.symbol import Symbol
  from sympy.external import import_module
  from sympy.functions.elementary.exponential import log
  from sympy.functions.elementary.integers import floor, ceiling
  from sympy.functions.elementary.miscellaneous import sqrt, cbrt, root, Min, Max, real_root, Rem
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.functions.special.delta_functions import Heaviside
  from sympy.utilities.lambdify import lambdify
  from sympy.testing.pytest import raises, skip, ignore_warnings
label_desc: Use image node_id 12 for calling a global function with example usage: test_issue_21399() without return types