map out vs prearrange

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. 

prearrange

verb
  • To arrange in advance. 

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