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An article such as Poseidon is put in a category by editing the article page, and the best place to discuss how an individual article should be categorized is usually the talk page of that article. In most cases, such as this, the article is watched by more people than the category, so posting on the article's talk page is more likely to receive attention. --Pipetricker (talk) 00:51, 10 February 2018 (UTC)[reply]