cooperate vs split up

cooperate

verb
  • To function in harmony, side by side 

  • To work or act together, especially for a common purpose or benefit. 

  • To allow for mutual unobstructed action 

  • To engage in economic cooperation. 

split up

adj
  • Divided or separated. 

verb
  • separate, disassociate, cause to come apart. 

  • Cease to be together, break apart from the group. 

How often have the words cooperate and split up occurred in a corpus of books? (source: Google Ngram Viewer )