anchor.diff:  ## FlashcardCollection (array)
   + 0: (Flashcard)
   + 1: (Flashcard)
  -+ 2: (Flashcard)++ 2: (Flashcard)
  +
  +## BadRequestResponse (object)
  ++ code: `E001` (string, required) - TODO sample error code
  ++ message: `Id cannot be null` (string, required) - TODO sample error message - human readable
positive.code:             Access-Control-Expose-Headers: Location
              Location: /decks/1111-0000-0000-000000000001/flashcards/1111-0000-0000-000000000002
  
      + Body
  
              + Response 200 (application/json)
              + Attributes (Flashcard)
  
  + Response 400 (application/json)
  
      This response is returned when flashcard validation failed.
  
      + Body
  
  
  ### Get Flashcard by ID [GET /decks/{deckId}/flashcards/{flashcardId}]
  
  
negative.code: 
  + Request (application/json)
  
      + Attributes (DeckWithoutId)
  
  + Response 200 (application/json)
  
  