disorder vs pencil in

disorder

verb
  • To throw into a state of disorder. 

  • To knock out of order or sequence. 

noun
  • A physical or mental malfunction. 

  • Absence of order; state of not being arranged in an orderly manner. 

  • A disturbance of civic peace or of public order. 

pencil in

verb
  • to provisionally schedule 

  • to fill in or write in using pencil 

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