firman vs laissez-passer

firman

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

laissez-passer

noun
  • A pass or permit; a document permitting the bearer to travel, sometimes issued as an emergency passport. 

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