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![trying to learn python tkinter. but when i run the following code the tkinter window does not open[error: "RMS" is not defined"] " - Stack Overflow](https://i.stack.imgur.com/7gRBJ.png "trying to learn python tkinter. but when i run the following code the tkinter window does not open[error: \"RMS\" is not defined\"] \" - Stack Overflow")
trying to learn python tkinter. but when i run the following code the tkinter window does not open[error: "RMS" is not defined"] " - Stack Overflow
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