当A=a1:
A B C
===== ===== =====
a1 b1 c1
a1 b2 c2
a1 b5 c5
当A=a2:
A B C
===== ===== =====
a2 b3 c3
a2 b6 c6
当A=a3:
A B C
===== ===== =====
a3 b4 c4
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