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Proof step 1 from proof ac-okarrays (
previous step
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⊦ okarrays(r, fis, st) ↔ (∀ sk, val. sk × val ∈ fis → is_integervalue(val) ∧ is_fskey(sk) ∧ is_arraytype(sk .fs .type) ∧ okarray(st[r -- sk], sk .fs .type .type, val .intval, st))
A spec-lemma