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Don Quixote
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Used In
Don Quixote
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  • Now, I say, is the time when the virtue that is in thee is ripe, and endowed with efficacy to work the good that is looked for from thee.

  • There are no more uses of "efficacy" in the book.

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  • The doctor weighed the efficacy of each treatment against potential side-effects.
  • They held hearings to investigate concerns about the safety and efficacy of the vaccine.

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