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Proof step 7 from proof lookup-list-butlast (conclusion)

⊦ sks ≠ [] → st[r0 -- sks] = st[st[r0 -- sks .butlast] .refval -- sks .last]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
⊦ sks = [], st[r0 -- sks] = st[st[r0 -- sks .butlast] .refval -- sks .last]

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]