Q and A vs wringer

Q and A

noun
  • A period of time in which questions are asked of a person; an interview. 

wringer

noun
  • One who wrings. 

  • A device for drying laundry consisting of two rollers between which the wet laundry is squeezed (or wrung); a mangle. 

  • Something that causes pain, hardship, or exertion; an ordeal. 

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