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When you edit pages:

 Please respect others' copyrights; do not copy and paste the contents from webpages directly.
 Please use a neutral point of view when editing articles; this is possibly the most important Wikipedia policy.
 If you are testing, please use the Sandbox to do so. 
 Do not add unreasonable contents into any articles, such as copyrighted text, advertisement messages, and text that is not related to an article's subject. Adding such content or editing articles maliciously is considered vandalism.