머리와 꼬리가 중간에 스스로 적응하는 배치를 고정시킨다

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        	ssssdfs
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관련 링크:
http://www.cnblogs.com/ckmouse/archive/2012/02/14/2351043.html
http://www.cnblogs.com/bydclouds/archive/2014/09/24/3991571.html

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