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void setup() {
size (400, 400);
}
void draw() {
background (0);
for (int y = 0; y <= height; y= y + 40) {
for (int x=0; x <= width; x=x +40) {
noStroke();
fill (255);
rect (x, y, mouseX+ (-mouseY), mouseY +(-mouseX));
}
}
}