Hamilt_7_dir
1 -   (1 = )
0 -  (1 = )
1 -  (1 = )
7 -  
A B C D E F G
A -> B=1
B -> C=2 E=8 
C -> D=3 
D -> A=4
E -> F=5
F -> G=6
G -> C=9 E=7
