A | | B | OR | B | | A |
0 | 1 | 0 | 1 | 0 | 1 | 0 |
0 | 1 | 1 | 1 | 1 | 0 | 0 |
1 | 0 | 0 | 1 | 0 | 1 | 1 |
1 | 1 | 1 | 1 | 1 | 1 | 1 |