generate vs sell one on

generate

verb
  • To produce as a result of a chemical or physical process. 

  • To procreate, beget. 

  • To form a figure from a curve or solid. 

  • To appear or occur; be generated. 

  • To bring into being; give rise to. 

sell one on

How often have the words generate and sell one on occurred in a corpus of books? (source: Google Ngram Viewer )