introduce vs vacate

introduce

verb
  • To bring (something) into practice. 

  • To cause (someone) to be acquainted (with someone else). 

  • To add (something) to a system, a mixture, or a container. 

  • To make (something or someone) known by formal announcement or recommendation. 

vacate

verb
  • To leave an office or position. 

  • To have a court judgement set aside; to annul. 

  • To leave an area, usually as a result of orders from public authorities in the event of a riot or natural disaster. 

  • To move out of a dwelling, either by choice or by eviction. 

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