imply vs prevent

imply

verb
  • to have as a necessary consequence 

  • to suggest by logical inference 

  • to hint; to insinuate; to suggest tacitly and avoid a direct statement 

prevent

verb
  • To stop (an outcome); to keep from (doing something). 

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