| a1 | a2 | a3 | a4 |
x1 | <0.9, *> | <1, 0> | <0.95, *> | <0.9, 0.2> |
x2 | <0.6, 0.5> | <0, 1> | <0.1, 0.95> | <*, *> |
x3 | <0.2, 0.95> | <0.15, 0.98> | <*, 0.9> | <0.65, *> |