conceal vs deal in

conceal

verb
  • To hide something from view or from public knowledge, to try to keep something secret. 

deal in

verb
  • To accept (something or a piece of information) as a basis for a decision. 

  • To trade (buy and sell) a named commodity. 

  • To deal cards to someone entering a game; to enter someone into a game by dealing cards to that person. 

  • To have an interest in something. 

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