new_contents: from Card import Card
  
  class Deck:
      def __init__(self):
          self.cards = []
  
          for val in range(2, 15):
              for col in range(4):
                  self.cards.append(Card(val, col))
  
      def __str__(self):
          game_cards = ""
          for card in self.cards:
              if game_cards == "":
                  game_cards = str(card)
              else:
                  game_cards += ", " + str(card)
          return game_cards
subject: implement Deck