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Proof step 14 from proof prepost-decode-lpt (
previous step
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⊦ ⟪decode_lprops#(n, buf; lp, n0; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded(lp, subarray(buf, n, n0)) ∧ n + n0 ≤ # buf ∧ n0 = encoding-size(lp)))
A spec-lemma