Yeah. Thanks, Al, and you're right. We will go through this in much more detail on the 25th. But let me give you a sense for it. So you could imagine that we're predominantly working with integrators and OEMs of equipment. And if I think about the segment, the primary areas are around heavy duty vehicle, you know we're talking buses, trucks, vans, and some off-road vehicle, including ours. And the process that customers go through, you know the first question is, do you have an electrification plan, do you have an electrified part and that majority of the time they don't and some of the times they do? The next question is, have you thought about integrating hydrogen into your solution? And again, the next piece - the third piece is integrating and developing a solution, then doing a pilot of a product type, and then going into production. We improved moving people through that whole process. If I can just maybe talk about geographies, you're right. I mean, over the last few years, our attention has been on China, because we felt that was a rapidly growing market. So it kind of really supported by government initiative, but we have seen a strong pickup in Europe, and we're starting to see some traction in North America. And in our pipeline today, we have customers in all of those regions. We can put - we will give you more color on that in May, but I think that - hopefully that gives you a sense for the process we're going through, why it's taking time, and also the business and system development, which is closely tied together.