CLASSIFICATION +,* on subsets Ee
   
   a=. 0 0 0 0 1 1 1 1
   b=. 0 0 1 1 0 0 1 1
   c=. 0 1 0 1 0 1 0 1
   cct=. a,b,,:c
   cct
0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1
0 1 0 1 0 1 0 1
   
   2 3 5 +/ . * cct
0 5 3 8 2 7 5 10
   2 3 5 */ . ^ cct
1 5 3 15 2 10 6 30
   +/cct
0 1 1 2 1 2 2 3
   [ c2=.(2=+/cct)#"1 cct
0 1 1
1 0 1
1 1 0
   2 3 5 >./ . * c2
5 5 3
