co- vs self-

co-

prefix
  • together; mutually; jointly 

  • to the same degree 

  • partner or subordinate in an activity 

  • of the opposite, of the counterpart; dual 

self-

prefix
  • automatic 

  • of, by, in or with oneself or itself 

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