beget vs spark off

beget

verb
  • To cause; to produce. 

  • To bring forth. 

  • To father; to sire; to produce (a child). 

  • To happen to; befall. 

spark off

verb
  • To initiate something by providing the necessary conditions. 

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