carnet vs firman

carnet

noun
  • A customs document that allows the temporary duty-free importation of a particular article 

  • An admission pass. 

  • A ticket book, a collection of tickets in the form of a booklet often sold at a discount to single tickets. 

firman

noun
  • A royal decree issued by a sovereign in certain historical Islamic states, especially by the Sultan of Turkey. 

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