Well, there's -- I mean so many things, but one of the front-end challenges is making all those arrangements so your contractors can travel, like making sure that you fully understand what restrictions are at the border, what they're going to need to do to get across and how you test them and certify that they don't have COVID. How you keep crews apart, so you can imagine these, it's all kinds of tent infrastructure, separate washroom facilities, canteens, mobile canteens, those kinds of things so that we don't have any cross contamination between crews. And we certainly keep all our people separate from our contractors and keep our contractors separate from each other. And just lots of regular assessments, lots of rules that need to be followed. Lots of sanitization protocols, obviously, masks, sometimes double masks required, if people are working closely together in any kind of certain set of circumstances, that kind of thing. So far, we think we've got all the border issues well identified, and all our plans in place, so that the shots that are coming up in the coming months, I think we got a clear line of sight on everything we need to do and should be able to conduct our shots safely. But the risks are, changes at the border, or that are unforeseen, surprises, or God forbid, any kind of serious transmission and then all could slow things down or shut things down for a period of time. So it's not going to go perfectly for everybody. And that's -- it's a lot harder than normal conditions to conduct these outages safely as others have found. So yes, it's just; I think the risk is on the supply side, more than a reduction of demand at this stage.