code: def test_variable_order(self):
      self.assertEqual(
          "(a*12)", prod((3, 4, Variable("a", 1, 5))).render()
      )
  
imports: import unittest
  from PIL import Image
  from tinygrad.helpers import Context, ContextVar, merge_dicts, strip_parens, prod, round_up, fetch, fully_flatten, from_mv, to_mv
  from tinygrad.shape.symbolic import Variable, NumNode
label_desc: Use image node_id 4 for calling the TestProd obj's underlying member method code with example usage: obj.test_variable_order() without return types