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Proof step 25 from proof intshiftrsign-if (previous step)

⊦ sublist(0, n, bits) = boolvar ' + bits0 ↔ n = # bits0 + 1 ∧ (bits.first ↔ boolvar) ∧ sublist(0, n -1, bits.rest) = bits0

A spec-lemma