  CLASSIFICATION dot products Ef
   
       2 3 5 | 0 5 3 8 2 7 5 10
       4 2 1 | 0 1 2 3 4 5 6 7
       ------|-----------------
             | 0 0 0 0 1 1 1 1
             | 0 0 1 1 0 0 1 1
             | 0 1 0 1 0 1 0 1
   
   row0 =. 2 3 5 [ col5=. 1 0 1
   
   row0 * col5
2 0 5
   +/ row0 * col5
7
   
   row0 +/ . * cct
0 5 3 8 2 7 5 10
   row0 */ . ^ cct
1 5 3 15 2 10 6 30
   
   row0 ^ col5
2 1 5
   */ row0 ^ col5
10
