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Proof step 58 from proof prepost-read-log (
previous step
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EB_PAGE_SIZE ≤ # buf ⊦ ⟪decode_ref_node#(EB_PAGE_SIZE, buf; rnd; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded(rnd, subarray(buf, 0, EB_PAGE_SIZE))))
A spec-lemma