|   A2  |       U1  |       U2  |       U3  |       U4  |       W  |    
|   U1  |       1  |       3  |       1  |       1/5  |       0.154  |    
|   U2  |       1/3  |       1  |       1/3  |       1/7  |       0.064  |    
|   U3  |       1  |       3  |       1  |       1/5  |       0.154  |    
|   U4  |       5  |       7  |       5  |       1  |       0.628  |