ex- vs precursory

ex-

prefix
  • former, but still living (almost always used with a hyphen) 

  • out of 

  • outside 

  • Lacking. 

precursory

adj
  • Being or relating to a precursor; relating to events that will follow. 

noun
  • A precursor; a sign of the onset of something. 

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