C  D  G  H  M  N  Q  W
C  0  0  0  0  0  0  0  0 
D  5  0  0  0  0  0  0  0
G 12  2  0  0  0  0  0  0
H  2  4  3  0  0  0  0  0
M  2  3  2 10  0  0  0  0
N  2  4  1 18 16  0  0  0
Q  9 20  9  1  2  8  0  0
W  1  5  2  5 18 13  4  0