1、B
A
C
C
B
A
A
B
B
C
A
A
A
B
B
C
B
C
B
C
A
B
C
B
C
B
A
A
B
C
C
A
B
C
B
B
B
A
B
A
B
C
B
A
B
B
C
A
B
C
B
A
C
A
B
A
A
A
C
C
A
A
C
C
A
B
A
A
C
B
C
A
B
A
C
A
B
A
C
C
A
A
B
A
A
B
A
A
B
A
A
A
A
A
2、
B
C
C
B
C
B
C
A
B
B
A
A
C
C
A
B
A
C
B
B
A
C
B
B
C
C
A
B
C
C
B
C
B
A
B
C
A
A
B
B
C
A
B
A
C
B
B
B
A
C
B
B
C
C
A
B
B
C
A
B
B
C
A
C
A
B
C
C
C
A
C
A
B
B
A
C
A
A
A
B
B
C
C
C
C
A
C
C ?
B
？
B
A
C
C
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