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这组输入非法吗??

Posted by Isun at 2008-04-05 14:33:17 on Problem 1128
15
18
AAABBBCCCDDDEEEFFF
A.AB.BC.CD.DE.EF.F
AAABBBCCCDDDEEEFFF
GGGHHHIIIJJJKKKLLL
G.GH.HI.IJ.JK.KL.L
GGGHHHIIIJJJKKKLLL
MMMNNNOOOPPPQQQRRR
M.MN.NO.OP.PQ.QR.R
MMMNNNOOOPPPQQQRRR
SSSTTTUUUVVVWWWXXX
S.ST.TU.UV.VW.WX.X
SSSTTTUUUVVVWWWXXX
YYYZZZ............
Y.YZ.Z............
YYYZZZ............

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