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Proof step 3 from proof index-lookup-one (previous step)

⊦ ri[key + []] = ri[key] '

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list, inst: key-list-set name: c seq: ⊦ key + kx = key ' + kx subst: [kx, key] → [[], key] flags: <all paths>

Additional information

Used terms: [], key