map out vs prepare

map out

verb
  • To organise a plan; to analyze a situation; to figure out a problem. 

  • To create a map of an area. 

  • To make explicit; to explain in detail. 

prepare

verb
  • To make ready for a specific future purpose; to set up; to assemble or equip. 

  • To produce or make by combining elements; to synthesize, compound. 

  • To make ready for eating or drinking; to cook. 

  • To make oneself ready; to get ready, make preparation. 

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