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Proof step 23 from proof addclass-okarray (
previous step
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⊦ ¬ sk ∈ fis ∧ sk ≠ mkfs(class, void_type, `initstate' .field) ' → (r -- sk ∈ addclass(class, fis, st) ↔ r -- sk ∈ st)
Lemma
ac-in-10