code: def test_2d_grid_graph():
      # FC article claims 2d grid graph of size n is (3,3)-connected
      # and (5,9)-connected, but I don't think it is (5,9)-connected
      G = nx.grid_2d_graph(8, 8, periodic=True)
      assert nx.is_kl_connected(G, 3, 3)
      assert not nx.is_kl_connected(G, 5, 9)
      (H, graphOK) = nx.kl_connected_subgraph(
          G, 5, 9, same_as_graph=True
      )
      assert not graphOK
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_2d_grid_graph() without return types