co- vs mid-

co-

prefix
  • to the same degree 

  • together; mutually; jointly 

  • partner or subordinate in an activity 

  • of the opposite, of the counterpart; dual 

mid-

prefix
  • Amid. 

  • Denoting the middle part. 

  • Occupying a middle position. 

  • Intermediate 

  • During, in the middle of doing something. 

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