}Ŀб(𰸺ͽ)
֪錍(sh)
t
A1 B C
D
֪(sh)
t
A
B
C
D1
֪錍(sh)
t
A1
B C
D
֪ t
=
A 2 B 1 C2 1 D13
֪(sh)t
ֵ飨
A1 B C
D2
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