 { 0 , 1 } @ { - 1 , 0 , 1 } 
 0   0 
 0   0 - > 1 
 1           0 
 0           1                 - >                           2 
 3   0 
 2   0 
 1   0   - > 3 
 4   0 
 0   *   - >   4 
 1   *   - >   4   3   0 
