impose vs require

impose

verb
  • To establish or apply by authority. 

  • To practice a trick or deception (on or upon). 

  • To arrange in proper order on a table of stone or metal and lock up in a chase for printing; said of columns or pages of type, forms, etc. 

  • to enforce: compel to behave in a certain way 

  • To lay on, as the hands, in the religious rites of confirmation and ordination. 

  • to be an inconvenience (on or upon) 

require

verb
  • To demand, to insist upon (having); to call for authoritatively. 

  • To demand of (someone) to do something. 

  • Naturally to demand (something) as indispensable; to need, to call for as necessary. 

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