co- vs peri-

co-

prefix
  • together; mutually; jointly 

  • to the same degree 

  • partner or subordinate in an activity 

  • of the opposite, of the counterpart; dual 

peri-

prefix
  • around or surrounding 

  • near 

  • during 

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