if the following are true:

• expression state at time 69 = "iterate_args"
• arguments stack at time 69 = [ [ 12, [ ] ], [ ] ]
• parent stack at time 69 = [ __mul__(self.age, 12), [ ] ]

then parent stack at time 70 = [ __mul__(self.age, 12), [ ] ]

Start from the conclusion and work back up the proof. Click the arrow to show the parents.