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Theorem prepost-read-superblock

# avol ≠ 0, avol[0].mapped?, is-encoded(sb0, avol[0].data), ebm-vol-inv(avol) ⊦ ⟪persistence_io_read_superblock#(EB_PAGE_SIZE, LEB_SIZE, avol; sb; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → sb = sb0))

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