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So what do you do when you go to a customer and you bring your tanks out and fill them up and then take them back in? Yes, yep, and it's all of our customers, there's only a handful that have liquid at home. You've got to be what they call high flow, anybody who needs six liters per minute at rest or more. And then the highest we can go at any time is 12 liters per minute, anything above that they have to be hospitalized. I've got some clients who've been on liquid oxygen now for over 20 years. It makes a big difference to some people for sure.