CASE vs toolkit

CASE

noun
  • computer-aided software engineering. 

  • coatings, adhesives, sealants and elastomers. 

toolkit

noun
  • A set of software tools or components. 

  • Instructions to organise a protest. 

  • A set of personal abilities, skills, or resources to draw on. 

  • A set of guidelines or instructions. 

  • A set of tools kept together, especially comprising all the tools suitable for some particular type of work. 

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