Thank you. It's a very good question. On the competitive landscape, we definitely feel 2020 also onwards going forward will be very interesting. First thing first, we still see very strong demand for offline learning at the same time, combined with desire to have online exposure as well. So, on the offline side, in fact, we actually see fewer competitors. Some really cannot just survive during the pandemic and the people survived, especially like RISE offering OMO model becomes stronger. That's also why you see a very strong enrollment in fourth quarter. Normally, fourth quarter is not a peak season. However, the fourth quarter enrollment for us almost caught up with the third quarter of 2020. So, on the offline side, we feel very confident. We definitely are the top choices for parents and students. For online, there are more formats and players coming into the arena. I think Zebra as you mentioned, use AI to offer 15 minutes of classes -- class coaching and then they can offer at a very cheap price. The observation I have is that definitely attract a lot of young-aged kids and it's a very complementary courses to offline study. And in fact, during the survey, we can see that 30% of our students would have some form of online courses, either Zebra or a VIPKid. However, at the same time, the online students normally would also have one offline courses to complement that because the courses delivered online has a limited effect. So, going forward, we think these two formats will coexist. And even for RISE, as I mentioned during the presentation, we definitely see the demand, therefore we launched the 1:00 to 4:00 premium English small classes online, using foreign teachers. This is also a supplement to what we offer offline and through OMO. So on the higher grade, from S2 above the online foreign teacher is part of the normal courses. And for K3 and S1, we actually are selling our 1:00 to 4:00 premium online English small classes as additional courses to supplement them. And this year, this is part of the strategy as well. So, we think, right now, the student base, we target, we don't see impacted by the AI courses, of course, the efficacy are entirely different.