ive seen alot of videos of sakura doing A groove…uppercut like a million times…i know the notation for the uppercut but how do you cancel and do it like tat so many times?
just do dragon punches over and over. do the first dragon and once it connects a few hits,but early on,cancel it and continue to do another dragon punch-over and over
Fierce DP that is 
And on another note, that specific combo is a good chipper and guard breaker especially in a corner. Use the heavy punch uppercut. That way, you can land more ground hits before she reaches the air in which you never want her to do during the combo. If you do so, you will get severly punished…HARD!