For stickers. I hope you can find a way for us to trade stickers which we got more than once. Example, for an album, whenever we open a new sticker pack, new stickers will be labelled as new while the others are considered as duplicates. I hope there's a way to count these duplicates and when you reach a certain amount of stars for the duplicates, you can exchange them for a new sticker that you lack. That way you will still feel garatified even when opening a sticker pack with old stickers.