anchor.diff:  + 2: (Deck2)
   
   ### FlashcardCollection (array)
  -+ 0: (Flashcard0)
  -+ 1: (Flashcard1)
  -+ 2: (Flashcard2)
  ++ (Flashcard0)
  ++ (Flashcard1)
  ++ (Flashcard2)
   
   ### DeckWithCountCollection (array)
   + 0: (DeckWithCount0)
  
positive.code: 
  + Response 200 (application/json)
      + Attributes (Deck)
      
  ### Get all Decks [GET]
  
  + Response 200 (application/json)
  
negative.code:     + deckId: `1233-0000-0000-000000000001` (string, required) - deck UUID which contain flashcard
      + flashcardId: `1233-0000-0000-000000000001` (string, required) - flashcard UUID to delete
  
  + Response 204
  
  # Group User
  
  