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Yes. Here are several test cases which may be useful for you.

Posted by LoveLeeYue at 2010-03-20 23:55:24 on Problem 1229
In Reply To:Is DP OK? Posted by:intellhave at 2008-11-14 19:16:24
a.b.?
!.c

a.b.?
!.c.d.e


a.*.b.c.*.b
?.?.b.c.a.b

a.b.c.?
?.a

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