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function setup() {
createCanvas(400, 300);
rectMode(CENTER);
}
function draw() {
background(0);
stroke(255);
noFill();
line(mouseX-(width/4), mouseY-(height/4), mouseX+(width/4), mouseY-(height/4));
line(mouseX+(width/4), mouseY-(height/4), mouseX+(width/4), mouseY+(height/4));
line(mouseX+(width/4), mouseY+(height/4), mouseX-(width/4), mouseY+(height/4));
line(mouseX-(width/4), mouseY+(height/4), mouseX-(width/4), mouseY-(height/4));
}