i was really struck byhow your chapped her titles actually tell your story. So i want to go through each of the steps to solve the coal problem, which we will start with. slack is the story, one of thestories that you tell in that section the work place, chat wool. It's now a household name, but it actually came about a bit accidentally. And you also write about the importance of the atomic network. For slackto work, you need three people. But for r b b, it was 300 listings with a hundred reviewed ones. They realized that in order to get slack to work, they had to get entire teams use slack all at the same time.