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Proof step 14 from proof fix-butlast-longer (
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⊦ # bytes < n ∧ bytes ≠ [] → fillsgn(n, bytes) = (b2i(bytes.first) < 0 ⊃ i2b(~1);i2b(0)) ' + fillsgn(n -1, bytes)
Lemma
fillsgn-rec