mirror vs problem

mirror

noun
  • An object, person, or event that reflects or gives a picture of another. 

  • A disk, website or other resource that contains replicated data. 

  • A mirror carp. 

  • A kind of political self-help book, advising kings, princes, etc. on how to behave. 

  • A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it. 

verb
  • Of an event, activity, behaviour, etc, to be identical to; to be a copy of. 

  • To reflect, as in a mirror. 

  • To create something identical to (a web site, etc.). 

problem

noun
  • A difficulty that has to be resolved or dealt with. 

  • A puzzling circumstance. 

  • A set of moves required to complete a climb. 

  • A question to be answered, schoolwork exercise. 

  • Objection. 

  • Difficulty in accepting or understanding or refusal to accept or understand. 

adj
  • Causing a problem; problematic; troublesome. 

  • Difficult to train or guide; unruly. 

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