allo- vs co-

allo-

prefix
  • different; other. 

  • isomeric; especially, of amino acids having two chiral centres, the second diastereoisomer to be discovered or synthesized 

  • a diastereomer having the same configuration on four neighboring chiral carbon atoms as carbohydrate allose 

  • nonself; nonself but of the same species. 

  • variant. 

co-

prefix
  • of the opposite, of the counterpart; dual 

  • together; mutually; jointly 

  • to the same degree 

  • partner or subordinate in an activity 

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