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Theorem decode-contract

EB_PAGE_SIZE ≤ # buf ⊦ ⟪decode_pagesize#(EB_PAGE_SIZE, buf; a; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-pagesize(a, subarray(buf, 0, EB_PAGE_SIZE))))

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