aby vs persist

aby

verb
  • To endure or tolerate (something); to experience. 

persist

verb
  • To go on stubbornly or resolutely. 

  • To repeat an utterance. 

  • To cause to persist; make permanent. 

  • To continue to exist. 

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