· | a | b | c1 | c2 | v1 | v2 | x1 | x2 | y1 | y2 |
a | a | 0 | 0 | 0 | a | a | 0 | 0 | a | a |
b | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | b | b |
c1 | 0 | 0 | x1 | x1 | x1 | x1 | x1 | x1 | b | b |
c2 | 0 | 0 | x1 | x1 | x1 | x1 | x1 | x1 | b | b |
v1 | a | 0 | x1 | x1 | x1 | v1 | x1 | x1 | a | a |
v2 | a | 0 | x1 | x1 | x1 | v1 | x1 | x1 | a | a |
x1 | 0 | 0 | x1 | x1 | x1 | x1 | x1 | x1 | 0 | 0 |
x2 | 0 | 0 | x1 | x1 | x1 | x1 | x1 | x2 | 0 | 0 |
y1 | a | b | b | b | a | a | 0 | 0 | y1 | y1 |
y2 | a | b | b | b | a | a | 0 | 0 | y1 | y1 |