0 ≤ i0, j < 2 ^ i0, 0 ≤ j ⊦ 2 ^ i0 = (j + (2 ^ i0 - 1 + j) % 2 ^ i0) + 1
Used simplifier rules: ⊦ i ≤ 0 ∧ 0 ≤ j → i ≤ j;% ⊦ 0 < 2 ^ i ↔ 0 ≤ i;