Template:Dup
From RationalWiki
Place this template at the top of any duplicate articles, or pages which should be merged, using the form:
Replace "x" with the name of the article which it is duplicating. Put one at the top of each of the duplicated articles, linking to the other one.
Please also add the details of the articles at RationalWiki:Duplicate articles, where editors can discuss whether they should be merged.