assemble vs split up

assemble

verb
  • To put together. 

  • To translate from assembly language to machine code. 

  • To gather as a group. 

split up

verb
  • separate, disassociate, cause to come apart. 

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

adj
  • Divided or separated. 

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