[Leonard] (ph), thanks for the question. It's Steven. Yes. And for acknowledging, ruxolitinib’s incredible activity in terms of both spleen responses, but especially symptom improvement. And as you point out, it's a very high bar to beat. In terms of our own thinking, one has to be obviously careful in study design, inadequate powering in terms of endpoints and also making sure that you maintain adequate JAK inhibitor dose intensity going forward. And so, both just to point out in terms of our combination programs we talk about ALK2 first. You can see where it's heading. Clearly, we have an increase in hepcidin reduction with increasing doses, and we're starting to see very encouraging hemoglobin responses. So the thinking along those lines would be potentially looking at, in the first line setting an ability to prevent anemia development and thus maintain very importantly RUX dose intensity and get the maximum benefits in terms of JAK inhibition in spleen and symptoms. And so that's where that's heading. And hopefully, as we've said repeatedly, by next year we'll complete the dose escalation and be able to declare where we want to go. It's incredibly safe in terms of tolerability. So we're able to continue to dose escalate at the moment. In terms of the BET program, it's a little bit of a different thing in terms of tolerability. There's no one on target toxicity in terms of thrombocytopenia, in terms of going in higher doses. So in monotherapy, at the 12 milligram, we saw dose limiting toxicity there and we're back at the 10 milligram dose in terms of monotherapy. We're seeing, again, extremely encouraging spleen response, symptom response, and also occasionally hemoglobin improvement. But to your point, we have to think carefully about where to go, in terms of first line or suboptimal study. And, obviously, there's also there's a competitor reporting our BET data later this year, which we're going to watch carefully. And, again, to be repetitive, powering in terms of symptoms, you have to be very careful in the first line setting because ruxolitinib is so good. So that program as well, we'd like to declare by the end of year timeframe next year, earlier part of the year where we go in, in terms of registration directed efforts. And then also just to remind you completely different efforts, the CALR antibody is in the clinic now. Potentially disease modifying dash even curative in the 30% of CALR patients that are in the MA population and in the ET population. And that could be a completely different way of thinking if you can eliminate the clone and change the disease trajectory completely. And you wouldn't even be thinking then in terms of spleen and symptom response, you'd be eliminating the clone. So that's where we are with the program at the moment. Thanks.