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void setup() {
size(500, 500);
background(0,0,255);
}
void draw() {
fill(224,30,227);
ellipse(mouseX, mouseY, 100, 100); //last 2 numbers = soze of paintbrush
ellipse(50,450,100,100)
ellipse(450,450,100,100)
ellipse(50,50,100,100)
ellipse(450,50,100,100)
}