Sure. Good morning, Dave. So, the raw material trends, as you think about it, obviously have come off in first quarter and second quarter. And it's actually helpful to think about raw material trends, you know, are back to the third quarter of 2018, right? So, you know, with the trade war, we saw, you know, the price of our petrochemical derivatives that we're buying, for example, come off a lot last year faster than oil did. So, even though oil came off a lot this year, many of the derivatives of oil had already come off pretty substantially. A big part of the raw material trend from all of this, you know, happened last year as opposed to this year. But we certainly have seen some benefits in raw materials, you know, in the first half of this year as we look to the second half of the year, you know, as some raws [ph], I think, are expected to stay relatively flat or moderated, if you look at like paraxylene [ph]. But then you've got other places like you saw already in the second quarter where propane, you know, moved up pretty dramatically and PGP didn't. So, you've got things moving around a lot of different directions. We're now expecting a huge raw material headwind as we look at the back half of the year. Our forecasting and plans assume that there's going to be some increase in some of those raw material costs. But we have a bunch of, you know, plans in place and like in chemical intermediates, we're moving prices up already consistent with the raw material environment to stay on track. But we think we're in good shape as far as spreads go when it comes to the back half of the year.