aporia vs contradictio in terminis

aporia

noun
  • An insoluble contradiction in a text's meaning; a logical impasse suggested by a text or speaker. 

  • An expression of deliberation with oneself regarding uncertainty or doubt as to how to proceed. 

contradictio in terminis

noun
  • contradiction in terms 

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