C D
C A
C C
C A
C B
D C
D A
D C
D A
D B
A C
A D
A C
A A
A B
C C
C D
C A
C A
C B
A C
A D
A A
A C
A B
B C
B D
B A
B C
B A
AD AD
AD AD
DAA DAA
DAA DAA
17