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function setup(){
createCanvas(windowWidth, windowHeight)
}
function draw(){
background(57,203,240);
strokeWeight(25);
stroke(250,35,15);
line(0, 0, mouseX, mouseY);
line(width, height, mouseX, mouseY);
line(width, 0, mouseX, mouseY);
line(0, height, mouseX, mouseY);
}