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Principle of deontic logic, named by Bernard Williams. It states that if one ought to do A and ought to do B, then one ought to do both A and B. If it is accepted, it puts pressure on the principle that ‘ought implies can’, since arguably there may arise occasions on which, for instance, I ought to repay A, and ought to repay B, but cannot repay both A and B.

Subjects: Philosophy.

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