liberate vs set back

liberate

verb
  • To release from servitude or unjust rule. 

  • To release from chemical bonds or solutions. 

  • To acquire from an enemy during wartime, used especially of cities, regions, and other population centers. 

  • To release from slavery: to manumit. 

  • To release from restraint or inhibition. 

  • To acquire from another by theft or force: to steal, to rob. 

set back

verb
  • To delay or obstruct. 

  • To remove from or allow distance. 

  • To install or position behind a boundary or surface, or in a recess. 

  • To cost money. 

  • To reverse, go backwards. 

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