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Q-principle
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In the Neo-Gricean approach to semantics and pragmatics championed by Yale linguist Laurence Horn, the Q-principle is a reformulation of Paul Grice's maxim of quantity combined with the first two sub-maxims of manner. The Q-principle states: "Say as much as you can ." As such it interacts with the R-principle, which states: "Say no more than you must ."