if the following are true:

• expression state at time 44 = "iterate_args"
• arguments stack at time 44 = [ [ age, [ ] ], [ ] ]
• parent stack at time 44 = [ self."age" = age, [ ] ]

then parent stack at time 45 = [ self."age" = age, [ ] ]

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