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Proof step 17 from proof prepost-erase-worker-helper (
previous step
)
ubi-io-inv(apebs), ubi-io-erase-pre(n, apebs) ⊦ ⟪aubi_io_sync_erase#(n; apebs; err)⟫ ubi-io-inv(apebs)
A spec-lemma