perfect example of its kind vs prototype

perfect example of its kind

prototype

verb
  • To create a prototype of. 

noun
  • An original form or object which is a basis for other forms or objects (particularly manufactured items), or for its generalizations and models. 

  • An early sample or model built to test a concept or process. 

  • A type of race car, a racing sports car not based on a production car. A 4-wheeled cockpit-seating car built especially for racing on sports car circuits, that does not use the silhouette related to a consumer road car. 

  • An instance of a category or a concept that combines its most representative attributes. 

  • A declaration of a function that specifies the name, return type, and parameters, but none of the body or actual code. 

How often have the words perfect example of its kind and prototype occurred in a corpus of books? (source: Google Ngram Viewer )