mistake vs straighten out

mistake

verb
  • To understand wrongly, taking one thing or person for another. 

noun
  • An error; a blunder. 

  • A pitch which was intended to be pitched in a hard-to-hit location, but instead ends up in an easy-to-hit place. 

straighten out

verb
  • To correct; to stop doing something wrong. 

  • To make straight. 

  • To tidy, neaten, or organize. 

  • To correct or rectify. 

  • To eliminate confusion from or concerning. 

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