A B 4 D 2 F 3
B A 4 C 4 D 1 E 3 G 2
C B 4 E 2 H 3
D A 2 B 1 F 2 G 3
E B 3 C 2 G 2 H 2 J 3
F A 3 D 2 I 1 K 4
G B 2 D 3 E 2 I 2 J 3
H C 3 E 2 J 1 M 3
I F 1 G 2 K 1 L 3 N 2
J E 3 G 3 H 1 L 2 M 2
K F 4 I 1 N 2 P 2
L I 3 J 2 N 2 O 2 Q 1
M H 3 J 2 O 1 R 3
N I 2 K 2 L 2 P 1 Q 3
O L 2 M 1 Q 1 R 2
P K 2 N 1
Q N 3 L 1 O 1
R O 2 M 3