decide vs preform

decide

verb
  • to resolve (a contest, problem, dispute, etc.); to choose, determine, or settle 

  • to make a judgment, especially after deliberation 

  • to cause someone to come to a decision 

preform

verb
  • To shape something before some other operation. 

noun
  • The rough, incomplete and unused basic form of a stone tool. 

  • An object that has undergone preliminary shaping but is not yet in its final form. 

  • A word that is no longer in use, but has been reconstructed from current ones. 

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