Ben vs c-note

Ben

noun
  • A US$100 bill, which bears a portrait of Benjamin Franklin. Often used in the plural form to indicate large sums of money. 

name
  • A county of Chaharmahal and Bakhtiari Province, Iran. 

  • The capital city of Ben County, Chaharmahal and Bakhtiari Province, Iran. 

  • A shortening of the male given name Benjamin or, less often, of Benedict. 

c-note

noun
  • A one-hundred dollar banknote. 

  • The lowest note of an instrument, written below the staff and the D note. 

How often have the words Ben and c-note occurred in a corpus of books? (source: Google Ngram Viewer )