introduce vs repeal

introduce

verb
  • To bring (something) into practice. 

  • To cause (someone) to be acquainted (with someone else). 

  • To add (something) to a system, a mixture, or a container. 

  • To make (something or someone) known by formal announcement or recommendation. 

repeal

verb
  • To suppress; to repel. 

  • To recall; to summon (a person) again; to bring (a person) back from exile or banishment. 

  • To cancel, invalidate, annul. 

noun
  • An act or instance of repealing. 

How often have the words introduce and repeal occurred in a corpus of books? (source: Google Ngram Viewer )