code: def test_combinations_of_len():
      l = [1, 2, 3]
      assert combinations_of_len(l, 2) == [
          (1,),
          (2,),
          (3,),
          (1, 2),
          (1, 3),
          (2, 3),
      ]
  
imports: from Adversary.utils import *
label_desc: Use image node_id 2 for calling a global function with example usage: test_combinations_of_len() without return types