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Proof step 16 from proof int2bits-restsgn (previous step)

0 < i, 0 ≤ j, 2 ^ i < j, j < 2 * 2 ^ i ⊦ sgn(uint2bits(2 ^ (i + 2) - j).rest) = uint2bits(2 ^ (i + 2) - j).rest

Lemma uint2bits-restsgn