| U1 | U3 | U4 | U5 | U6 |
U1 | 1 | 1 | 2 | 3 | 2 |
U3 | 1 | 1 | 3 | 2 | 2 |
U4 | 1/2 | 1/3 | 1 | 1/2 | 1 |
U5 | 1/3 | 1/2 | 2 | 1 | 2 |
U6 | 1/2 | 1/2 | 1 | 1/2 | 1 |