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function setup() {
createCanvas(600, 400);
}
function draw() {
background(0);
stroke(255);
strokeWeight(4);
noFill();
if (mouseX > 300 && mouseX < 400 && mouseY > 200 && mouseY < 300) {
fill(255, 0, 200);
}
rect(300, 200, 100, 100);
}