| j + i * 256 = (i0 + 255) * 256 + j0 + 255, j0 < 0, j + i * 256 < 65535, j < 256, 0 ≤ i, 0 ≤ j, ~255 ≤ j0, i0 < ~255, i0 < j0, i0 < 0 ⊦ 255 + j0 = j |
(i0 + 255) * 256 + j0 + 255 < 0, j + i * 256 = (i0 + 255) * 256 + j0 + 255, j0 < 0, j + i * 256 < 65535, j < 256, 0 ≤ i, 0 ≤ j, ~255 ≤ j0, i0 < ~255, i0 < j0, i0 < 0 ⊦ 255 + j0 = j
j + i * 256 = (i0 + 255) * 256 + j0 + 255, j0 < 0, j + i * 256 < 65535, j < 256, 0 ≤ i, 0 ≤ j, ~255 ≤ j0, i0 < ~255, i0 < j0, i0 < 0 ⊦ (i0 + 255) * 256 + j0 + 255 < 0, 255 + j0 = j
Used formulas: (i0 + 255) * 256 + j0 + 255 < 0