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of the twelfth and thirteenth centuries developed Aristotle's ideas. For example, Gilbert of Poitiers divides Aristotle's ten categories into two sets, primary and secondary, according to whether they inhere in the subject or not:
*Primary categories: Substance, Relation, Quantity and Quality
*Secondary categories: Place, Time, Situation, Condition, Action, PassionFurthermore, following the Neoplatonist Porphyry's

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