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自己猜的3+3+3+3,不知道是否可行
9 V& H9 ]' y* I车头(前):
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black:2,3,5,6,8,9,11,12
+ _, L' ~( m$ b9 [ u车厢:( ~+ J K* E3 |+ g, S
white:2,5,8,11* Z8 s1 y/ F% d& a) T
black:1,3,4,6,7,9,10,12
! M( Y' J% w; \9 S7 h# s车头(后)8 c7 `8 k3 o8 S. S1 A* B
white:3,6,9,12
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