anchor.diff:  + (FlashcardResult1)
   + (FlashcardResult2)
   
  +### FlashcardResultForUserCollection (array)
  ++ (FlashcardResultForUser0)
  ++ (FlashcardResultForUser1)
  ++ (FlashcardResultForUser2)
  +
   ## 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: ### FlashcardResult2 (object)
  + flashcardId: `369f0665-c895-41bb-bede-62b443519964` (string, required) - Flashcard UUID
  + isCorrectAnswer: `true` (boolean, required) - Shows whether an answer was correct or not
  
  ## Collections
  
  
negative.code: 
  ### Deck (DeckWithoutId)
  + id: `12345678-9012-3456-7890-123456789012` (string, required) - Deck UUID, 36 chars, 8-4-4-4-12 chars
  + creatorEmail: `test@mail.com` (string, required) - email of a user which created a deck
  
  ### FlashcardWithoutId (object)
  + question: `Sample question` (string, required) - question attribute for Flashcard
  