eradicate vs pencil in

eradicate

verb
  • To pull up by the roots; to uproot. 

  • To destroy completely; to reduce to nothing radically; to put an end to; to extirpate. 

pencil in

verb
  • to provisionally schedule 

  • to fill in or write in using pencil 

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