| j0 + 8 * i1 + j1 * 2 = 8 * i1 + j0 + j1 * 2, j0 ≤ 0, i1 * 4 + j1 ≤ ~3, i1 * 4 + j1 < 0, abs(j0) < 2, abs(j1) < 4, i1 ≤ 0, j1 ≤ 0, j0 + 8 * i1 + j1 * 2 < ~7, j0 + 8 * i1 + j1 * 2 < 0 ⊦ i1 = (j0 + 8 * i1 + j1 * 2) / 8 |
j0 ≤ 0, i1 * 4 + j1 ≤ ~3, i1 * 4 + j1 < 0, abs(j0) < 2, abs(j1) < 4, i1 ≤ 0, j1 ≤ 0, 8 * i1 + j0 + j1 * 2 < ~7, 8 * i1 + j0 + j1 * 2 < 0 ⊦ i1 = (8 * i1 + j0 + j1 * 2) / 8