Kristofides-302tabl 10.5a
1 -   (1 = )
0 -  (1 = )
1 -  (1 = )
4 -  
A B C D
A ->     B=12 C=2 D=20
B -> A=0      C=2 D=8
C -> A=2 B=14     D=22
D -> A=8 B=8 C=10

