code: def xyz_levels() -> XYZ_Levels:
      return [0, 1, 2], [0, 1], [[0, 1, 2], [1, 2, 3]], [-0.5, 1.5, 3.5]
  
imports: from __future__ import annotations
  import pytest
  from typing import TYPE_CHECKING
  import numpy
  from bokeh.plotting.contour import FillData, LineData, contour_data, from_contour
label_desc: Use image node_id 2 for calling a global function with example usage: xyz_levels() and returns: list,  list,  list,  list