Yes. So, Ricky, obviously, the, you know, size of the revenue we've generated from COVID, which more than offset the base business has materially impacted our margins and expanded them greatly relative to our historical margins. So, as we, you know, progress. We'll talk more about this at Investor Day, but we progress into a future where, you know, COVID testing is still around for, you know, for a while. As Steve said, we don't expect it to go away completely, certainly, by 2022. It's going to be less material to our top line and to our margin. So, where will our base business be? Once we get back to the pre-pandemic levels of 2019, I would expect our base business to be, you know, slightly higher margin than it was pre-pandemic. Because as you look at, you know, our invigorate program, which we continue to drive, even during the pandemic, and you look at the offsets of the pay for is that we usually talk about, including wage inflation and price erosion, you know, given the pause on PAMA this year, and given, you know, the fact that we've done really well and other price concessions, despite, you know, significant increases in our that was warranted during the pandemic, you know, as we wanted to reward our employees for their incredible contributions in getting us up and running, operating well threw it, and obviously driving strong company results. And when I net all those together, you know, that level of business should be more profitable. And then going forward from that, when we get back to the growth that you saw in 2019, and you saw in the first two months of 2020, and our ability to leverage that growth, you know, I would expect to see margin expansion on the base business, but of course, that will be partially offset for a period of time, as the COVID revenues and margins, you know, fall down. So, you know, longer-term, the good news is, you know, we were on a good path on growth and margin expansion pre-pandemic, and we will, you know, we'll get back there. But for a while, it'll be somewhat masked by the COVID decline that's inevitable, you know, over the next, certainly 18 months or so.