Proof: Get Iterate Expr 7

Let's prove the following theorem:

if the following are true:

expression state at time 7 = "iterate_args"
arguments stack at time 7 = [ [ "Estonia", [ ] ], [ [ entry "MX": "Mexico", [ ] ], [ ] ] ]

then the expression at time 8 = "Estonia"

Proof:

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Given

1	expression state at time 7 = "iterate_args"
2	arguments stack at time 7 = [ [ "Estonia", [ ] ], [ [ entry "MX": "Mexico", [ ] ], [ ] ] ]

Proof Table

#	Claim	Reason
1	the expression at time (7 + 1) = "Estonia"	if expression state at time 7 = "iterate_args" and arguments stack at time 7 = [ [ "Estonia", [ ] ], [ [ entry "MX": "Mexico", [ ] ], [ ] ] ], then the expression at time (7 + 1) = "Estonia" (Iterate Arguments Expression Property)
2	7 + 1 = 8	7 + 1 = 8 (Fixed Value Statement)
3	the expression at time (7 + 1) = the expression at time 8	if 7 + 1 = 8, then the expression at time (7 + 1) = the expression at time 8 (Substitution)
4	the expression at time 8 = "Estonia"	if the expression at time (7 + 1) = the expression at time 8 and the expression at time (7 + 1) = "Estonia", then the expression at time 8 = "Estonia" (Transitive Property of Equality Variation 2)

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