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Editors sometimes make the mistake of thinking that if A is published by a reliable source, and B is published by a reliable source, then A and B can be joined together in an article to advance position C. However, this would be an example of a new synthesis of published material serving to advance a position, and as such it would constitute original research.[6] ""A and B, therefore C"" is acceptable only if a reliable source has published this argument in relation to the topic of the article. - Wikipedia's policies on OR/Synthesis 
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