| U | e1 | e2 | e3 | e4 | d |
| x1 | 0 | 1 | 2 | 1 | 0 |
| x2 | 0 | 2 | 1 | 1 | 1 |
| x3 | 1 | 0 | 1 | 1 | 0 |
| x4 | 1 | 0 | 1 | 1 | 1 |
| x5 | 1 | 1 | 1 | 1 | 0 |
| x6 | 1 | 1 | 1 | 1 | 1 |
| x7 | 1 | 1 | 0 | 1 | 0 |
| x8 | 1 | 1 | 0 | 0 | 1 |