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Proof step 6 from proof decode-contract (previous step)

n + ENCODED_ELEM_SIZE ≤ # buf ⊦ ⟪decode_nonempty#(n, buf; a; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-nonempty(a, subarray(buf, n, ENCODED_ELEM_SIZE))))

A spec-lemma