I need help.
Context: On button A pressed, I drew a square using the microturtle extension of pen-down. Then on button B pressed, I drew rectangle again using pen-down.
On button A+B pressed, I clear screen
However, I realised that even when I pressed A+B, and then I press say A, the previous pattern of rectangle appears again while the LED drew the square.
Question: how do I permanently erase the pen trail so that I see only rectangle when I press B / see only square when I press A?