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Great! Thank you for all !
Thank you ,sir! I made it However, i still wonder some problems with this robot. I want to make the robot after draw everything,it goes back to home-stay( a place at the beginning exactly) to ready for a new graph. Therefore if i want it to draw again the old graph,it can make a graph that can overlap the old one! In fact ,your instructions are really great because it can get back to the home-stay but not really because i see it turn an angle when i compare to the begin position.Do you have any ideal to make that get back exactly the home-stay?