A
A
B
B
B
B
A
B
A
B
A
B
)
A
A
A
A
B
A
A
A
B
A
A
A
B
A
A
A
B
A
A
A
B
)
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
A
)
A
32