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题目说的不清楚啊，没说不出现lot自己闭合的情况嘛

Posted by blablabla at 2007-02-13 00:01:32 on Problem 1788 
比如


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|                 | 
|   -----------   |
|  |           |  |
|  |           |  |
|  |           |  |
|  |           |  |
 --------------   |
   |              |
   |--------------|
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