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int r = 2;
void setup() {
size(400, 400);
background(250, 120);
}
void draw() {
for (int x=10; x< width; x = x+20) {
for (int y=10; y<height; y = y+20) {
stroke(random(r));
fill(255, 30);
ellipse(x, y, 40, 40);
}
}
r = mouseY;
}