intervolve vs pretzelize

intervolve

verb
  • To twist or coil together. 

  • To involve one with another. 

pretzelize

verb
  • To bend, twist, or contort; to pretzel. 

  • To deform a simple linear idea into a superfluously complex explanation. 

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