Test_a - Pairs
0 -   (1 = )
0 -  (1 = )
1 -  (1 = )
6 -  
A B C D E F
A -> E=1
B -> E=2
C -> F=3
D -> F=4
E -> A=1 B=2 F=7
F -> C=3 D=4 E=7


