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Proof step 5 from proof validmode (previous step)

st[_mode] = noval ⊦ validmode(str, st) ↔ _mode ∈ st

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[crewrite-arg: validmode-def, F, [st, str] → [st, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, str)]]