get rid of vs maintain

get rid of

verb
  • to rid oneself of; dispose (of); to remove; to abolish; to lose 

maintain

verb
  • To keep up; to preserve; to uphold (a state, condition etc.). 

  • To declare or affirm (a clause) to be true; to assert. 

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