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Proof step 141 from proof prepost-write-once (previous step)

⊦ valid-eraseq(apebs, q) → (valid-eraseq(apebs, q + eq-entry(n, lref) ') ↔ n < # apebs ∧ (valid-peb(apebs[n]) → lref = apebs[n].vidhdr.vol × apebs[n].vidhdr.leb))

Proof step 141 from proof prepost-write-once (previous step)

A spec-lemma