code: def test_model_terms_levels_interaction(crossed_data):
      crossed_data["fourcats"] = (
          sum([[x] * 10 for x in ["a", "b", "c", "d"]], list()) * 3
      )
      model = bmb.Model("Y ~ threecats*fourcats", crossed_data)
  
      assert model.response_component.terms[
          "threecats:fourcats"
      ].levels == [
          "b, b",
          "b, c",
          "b, d",
          "c, b",
          "c, c",
          "c, d",
      ]
  
imports: import logging
  from functools import reduce
  from operator import add
  from os.path import dirname, join
  import arviz
  import numpy
  import pandas
  import pymc
  import pytest
  from formulae import design_matrices
  import bambi
  from bambi.terms import CommonTerm, GroupSpecificTerm
label_desc: Use image node_id 13 for calling a global function with example usage: test_model_terms_levels_interaction(crossed_data) without return types