explicit vs indirect

explicit

noun
  • The final few words of a text. 

adj
  • Very specific, clear, or detailed. 

  • Containing material (e.g. language or film footage) that might be deemed offensive or graphic. 

indirect

verb
  • To access by means of indirection; to dereference. 

adj
  • Not of obvious or immediate cause, but as a secondary result 

  • Not focused straight at the target or subject, but by more subtle means 

  • Not involving the quickest, shortest, or most convenient path 

noun
  • An indirect cost. 

  • An indirect radiator 

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