chalk out vs rough out

chalk out

verb
  • to make (plans); to sketch 

  • Of a multi-race wager, to lose to the favorite in all of the remaining races. 

  • To draw or write down using chalk 

rough out

verb
  • To produce (a plan, diagram etc.) in rough. 

  • To create the rough shape of a sculpture from a large block of wood, stone, etc. 

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