ROI and f2 the App Store's first with say a very limited set of features but already productive in order to get first insights from production and usage and then we continually improve the app up to the status where we are now where the automatic handshake is working and where we are waiting for Google and Apple to provide further features in order to further improve i'b what were the challenges in developing this app and how are you able to develop it so quickly seeing that Germany is still trying to launch their up quality the challenge is