code: def test_k_is_6():
      G = nx.Graph(
          [
              (9, 1),
              (9, 2),
              (9, 3),
              (9, 4),
              (9, 5),
              (9, 6),
              (9, 7),
              (10, 1),
              (10, 2),
              (10, 3),
              (10, 4),
              (10, 5),
              (10, 6),
              (10, 8),
              (11, 1),
              (11, 2),
              (11, 3),
              (11, 4),
              (11, 5),
              (11, 7),
              (11, 8),
              (12, 1),
              (12, 2),
              (12, 3),
              (12, 4),
              (12, 6),
              (12, 7),
              (12, 8),
              (13, 1),
              (13, 2),
              (13, 3),
              (13, 5),
              (13, 6),
              (13, 7),
              (13, 8),
              (14, 1),
              (14, 2),
              (14, 4),
              (14, 5),
              (14, 6),
              (14, 7),
              (14, 8),
              (15, 1),
              (15, 3),
              (15, 4),
              (15, 5),
              (15, 6),
              (15, 7),
              (15, 8),
              (16, 2),
              (16, 3),
              (16, 4),
              (16, 5),
              (16, 6),
              (16, 7),
              (16, 8),
          ]
      )
      assert nx.bipartite.maximal_extendability(G) == 6
  
file_path: networkx/networkx/algorithms/bipartite/tests/test_extendability.py
imports: import pytest
  import networkx
label_desc: Use image node_id 10 for calling a global function with example usage: test_k_is_6() without return types