and healthier but they had bae more productive at work and that's what we found. we found that the four days that they're here, they're overwhelmingly more productive than your traditional five days a week. >> so, you are not -- and -- and i mean, in some cases, perhaps they are working few hours. but in many, many cases they are probably not. right? i mean, they are doing more on the days they are in, they're working longer. i know that people can do things on friday, right? it's not as if they can't. but, you no he, i know during the trial, what is it, close to 90% of your employees said they were more efficient but here is my question for you. if they knew they were in a trial to get four days a week, you know, i can see why they would say they're more efficient. do you have any concerns you could see a drop in productivity as time goes on? >> i don't because we measure what's important in the company. so, we don't measure the amount of time you spend at work, how you work, where you work from. we measure the impact that you deliver to the company. so, we keep it very simple for