subsume vs tie in

subsume

verb
  • To consider an occurrence as part of a principle or rule; to colligate 

  • To place (any one cognition) under another as belonging to it; to include or contain something else. 

tie in

verb
  • to fit in or harmonize (with) 

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