flysheet vs memo

flysheet

noun
  • A printed leaflet or pamphlet. 

  • An extra cover of a tent to protect against insects and bad weather. 

memo

noun
  • A short note; a memorandum. 

  • A record of partial results that can be reused later without recomputation. 

verb
  • To record something; to make a note of something. 

  • To send someone a note about something, for the record. 

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