i0 < 0, abs(i % j) < j, i % j < i0, i0 + j ≤ 1, 0 < j ⊦
abs(i % j) < j, i % j < i0, i0 + j ≤ 1, 0 < j ⊦ i0 < 0
Used formulas: i0 < 0