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Proof step 62 from proof inv-recover (previous step)

ebm-vol-inv(avol), sb.log < # avol, avol[sb.log].mapped?, is-encoded(log0, avol[sb.log].data) ⊦ ⟪persistence_io_read_log#(sb, EB_PAGE_SIZE, LEB_SIZE, avol; logoff; log, err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → log = log0))

Lemma prepost-read-log