Yes. Thanks, Trevor. We can -- I can cover, I think all three. So quarter four, we did see an improvement in the overall tax rate both on the core tax rate and underlying tax rate and that was predominantly driven by an acceleration -- an acceleration of the legal entity optimization, so we reduced the number of entities. And we went actually we started the -- after the acquisition of Shire, we had 400 entities and we reduced those down to 240. And so we got some tax benefits there. We also improved or accelerate some tax structures, where we were able to reduce the Japan or Japanese CFC taxes. And so I think they're the key drivers that were able to really drive an improved core tax rate and underlying tax rate. In fact, our tax rate improved by 6% versus fiscal year 2019. So I think that was a testament to the speed of integration also legal entity optimization, as well as the tax restructuring. Your second question was regarding leverage. I think you mean -- if I understood you correct is the margin. So what you mean by leverage here? Is that what -- I think that's what you mean? And so what we're saying is our margin will be approximately 30%. This year in 2020, we, our margin we landed at 30.2%. So the margin will be underlined, but underlying cooperating profit margin we think it will be pretty close to what we saw in fiscal year 2020. And that's despite the R&D investment, a step-up of R&D investment of over US$600 million. And so how are we absorbing this investment in R&D in 2021? You still have the same margin that we delivered in 2020. The key reason for that is twofold. One, the acceleration of the top-line revenue, so that's growing, you'll see in 2020, our underlying revenue grew by low-single-digit of 2.2%. In 2021, we're accelerating the top-line revenue to mid-single digit. And the second reason why we believe we can maintain the margin is because we delivered the synergies one year in advance. And so we'll see a significant carryover there as well, predominantly driven by procurement savings, headcount savings, and also SG&A was a key driver for that OpEx efficiencies. And then the third piece you asked about the COVID impact. You may recall this time last year when we gave our guidance, we said we were going to deliver the management guidance because we truly believed and felt that our portfolio was resilient. And I'm happy to say that after the results, we did prove that the portfolio was resilient. The headwinds we only had, we -- in general was the neuroscience business with VYVANSE and TRINTELLIX had some challenges because of the lockdowns in the U.S. So we saw that impact margins and VYVANSE does have a high margin. So but on the flip side, we did see some underspend in travel and meetings and events, but though about the same amount as the negative impact on the revenue for our neuroscience. So both of them basically netted off on the bottom line, so there was net-net neutral based on the COVID impact. I think, hopefully I answered your question. Thanks, Trevor.