i0 ≤ i3, i2 * (i3 + 1) + j0 ≤ i2 * i0, i2 * (i3 + 1) + j0 ≤ 0, abs(j0) < i2, i3 * i2 + j0 < 0, 0 < i2, j0 < i2, j0 ≤ 0 ⊦