continuity vs immutability

continuity

noun
  • Lack of interruption or disconnection; the quality of being continuous in space or time. 

  • The announcements and messages inserted by the broadcaster between programmes. 

  • A characteristic property of a continuous function. 

  • A narrative device in episodic fiction where previous and/or future events in a series of stories are accounted for in present stories. 

  • Consistency between multiple shots depicting the same scene but possibly filmed on different occasions. 

immutability

noun
  • The state of being unchangeable in the memory after creation. 

  • The state or quality of being immutable; immutableness. 

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