code: def test_base_of_reduce_preferred(abcde):
      r"""
                 a3
                /|
              a2 |
             /|  |
           a1 |  |
          /|  |  |
        a0 |  |  |
        |  |  |  |
        b0 b1 b2 b3
          \ \ / /
             c
  
      We really want to run b0 quickly
      """
      a, b, c, d, e = abcde
      dsk = {(a, i): (f, (a, i - 1), (b, i)) for i in [1, 2, 3]}
      dsk[(a, 0)] = (f, (b, 0))
      dsk.update({(b, i): (f, c, 1) for i in [0, 1, 2, 3]})
      dsk[c] = 1
  
      o = order(dsk)
      assert_topological_sort(dsk, o)
  
      assert o[(b, 0)] <= 1
      assert o[(b, 1)] <= 3
  
imports: from __future__ import annotations
  import inspect
  import pytest
  import dask
  from dask import delayed
  from dask.base import collections_to_dsk, key_split, visualize_dsk
  from dask.core import get_deps
  from dask.order import _connecting_to_roots, diagnostics, ndependencies, order
  from dask.utils_test import add, inc
label_desc: Use image node_id 6 for calling a global function with example usage: test_base_of_reduce_preferred(abcde) without return types