chalk out vs excogitate

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 

excogitate

verb
  • To think over something carefully; to consider fully; cogitate. 

  • To reach as a conclusion through reason or careful thought. 

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