After 2NT openned, if simple stayman used, There is a bidding sequence: 2NT-3C-3H-?? , We can bid 3S as slam try. But if puppet stayman used, the sequence should be: 2NT-3C-3D*-3S*-4H-??. Now, how to try? I think i would just bid "4 Diamonds", It's nothing about diamond. Am i right? If the responder has both Major suit, the sequence is: 2NT-3C-3D*-??. Now,what is 4C means ? Thanks very much for answer.