inset vs slip in

inset

verb
  • To insert something. 

  • To add an inset to something. 

  • To set in; infix or implant. 

noun
  • A small piece of material used to strengthen a garment. 

  • A smaller thing set into a larger thing, such as a small picture inside a larger one. 

  • Anything inserted. 

slip in

verb
  • To include (e.g. a certain word or phrase) into a sentence discreetly 

  • To enter discreetly 

  • To play a subtle pass into someone in a goalscoring position. 

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