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Proof step 12 from proof decode-contract (previous step)

n + ENCODED_ELEM_SIZE ≤ # buf, ¬ isempty(buf, n, ENCODED_ELEM_SIZE) ⊦ [decode#(n, buf; a, m; err)] ( is-encoded(a, subarray(buf, n, ENCODED_ELEM_SIZE)) ∧ m = ENCODED_ELEM_SIZE → err = ESUCCESS → subarray(buf, n, ENCODED_ELEM_SIZE) ≠ mkempbuf(ENCODED_ELEM_SIZE))

User applied rule skip call

And obtained the following new goals

Rule argument

pos: right 1

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