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The quality of a categorical proposition indicates the nature of the relationship it affirms between its subject and predicate terms: it is an affirmativeproposition if it states that the class designated by its subject term is included, either as a whole or only in part, within the class designated by its predicate term, and it is a negativeproposition if it wholly or partially excludes members of the subject class from the predicate class.

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Q: What are the quality of proposition?
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