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Proof step 4 from proof decode-contract (previous step)

⊦ ⟪decode#(n, buf; a, n0; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded(a, subarray(buf, n, n0)) ∧ n + n0 ≤ # buf ∧ n0 = encoding-size(a)))

A spec-lemma