co- vs quasi-

co-

prefix
  • to the same degree 

  • together; mutually; jointly 

  • partner or subordinate in an activity 

  • of the opposite, of the counterpart; dual 

quasi-

prefix
  • To a limited extent or degree, to be somewhat or partially. 

  • Resembling, appearing as. 

  • Almost, virtually. 

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