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Proof step 11 from proof decode-contract (previous step)

⊦ is-encoded-pagesize(a, buf) ↔ # buf = EB_PAGE_SIZE ∧ ENCODED_ELEM_SIZE ≤ EB_PAGE_SIZE ∧ is-encoded-nonempty(a, subarray(buf, 0, ENCODED_ELEM_SIZE)) ∧ ¬ isempty(buf)

Lemma is-encoded-pagesize