if the following are true:

• expression state at time 13 = "iterate_args"
• arguments stack at time 13 = [ [ entry "MX": "Mexico", [ ] ], [ ] ]
• parent stack at time 13 = [ {"ES": "Estonia", "MX": "Mexico"}, [ ] ]

then parent stack at time 14 = [ {"ES": "Estonia", "MX": "Mexico"}, [ ] ]

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