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Collins

contrapositive

  

      adj  
1    placed opposite or against  
      n  
2      (Logic)  
a    a conditional statement derived from another by negating and interchanging antecedent and consequent  
b    a categorial proposition obtained from another, esp. validly, by any of a number of operations including negation, transferring the terms, changing their quality, and also possibly weakening from universal to particular  
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