B4 | C20 | C21 | C22 | C23 | C24 | C25 | C26 |
C20 | 1 | 1 | 1/2 | 1/2 | 1 | 1 | 1 |
C21 | 1 | 1 | 1 | 2 | 2 | 2 | 1 |
C22 | 2 | 1 | 1 | 1 | 2 | 2 | 2 |
C23 | 2 | 1/2 | 1 | 1 | 2 | 3 | 3 |
C24 | 1 | 1/2 | 1/2 | 1/2 | 1 | 1 | 1 |
C25 | 1 | 1/2 | 1/2 | 1/3 | 1 | 1 | 1 |
C26 | 1 | 1 | 1/2 | 1/3 | 1 | 1 | 1 |