if the following are true:

• expression state at time 63 = "iterate_args"
• arguments stack at time 63 = [ [ self, [ ] ], [ [ 12, [ ] ], [ ] ] ]
• parent stack at time 63 = [ self.age, [ __mul__(self.age, 12), [ ] ] ]

then parent stack at time 64 = [ self.age, [ __mul__(self.age, 12), [ ] ] ]

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