prepare vs unfasten

prepare

verb
  • To make oneself ready; to get ready, make preparation. 

  • To make ready for a specific future purpose; to set up; to assemble or equip. 

  • To produce or make by combining elements; to synthesize, compound. 

  • To make ready for eating or drinking; to cook. 

unfasten

verb
  • To come unloosed or untied. 

  • To detach from any connecting agency or link; to disconnect. 

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