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Philosophy rules
(feddit.de)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Almost certainly because the most common opening sentence for an article follows the "[subject] is a member of [broader group]" structure and the more generalized you get, the more you get into entire areas of study, which are eventually classified as a kind of philosophy, which is just fancy-speak for "high-skill thinking."