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Hello everyone, welcome to a new lab video for Software Design. Im Stef and today well be talking about the chain of responsibility design pattern. So the design context for this lab is, we have a company which has a tech support and different kinds of issues go to different teams. So database related issues go to the database team, network related issues go to the network team, etc. And what we want to do, is we want to be able to easily create issues that are then automatically send to the right department. So we dont want to have to choose ourselves which department each issue goes to, but that should be done in the background. We also want to be able to easily add new departments, or remove departments that were already there and we want to be able to easily change which department different issues go to. So here you can see the UML diagram for our specific scenario. So as you can see we have an abstract IssueHandler class which can handle diff