A | u1 | u2 | u3 | u4 |
u1 | 1 | 5 | 7 | 9 |
u2 | 1/5 | 1 | 3 | 5 |
u3 | 1/7 | 1/3 | 1 | 3 |
u4 | 1/9 | 1/5 | 1/3 | 1 |