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Note: We relaunched the system for didactic materials recently, c.f. the corresponding blog post. Unfortunately, we could not transfer the credentials of registered accounts due to technical incompatibilities. If you want to log in, please register again with your mail address by clicking on the 'Login' button in the navigation bar and select 'Register'. (The old system is still running and can be found here. You can log in there with your old username and password. Please be aware that the old system will be shut down in the near future.)