A B
A A
A A
A B
B A
B A
B A
B B
A A
A B
A A
A B
A A
A B
A A
A B
B A
B B
B A
B A
DB BA
BA DB
CDD BCC
BAD ACB
BAD BCA
BCC CDD
ACB BAD
ACB BCA
BCA BAD
BCA ACB
15