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function setup() {
createCanvas(windowWidth, windowHeight);
background(100);
}
function draw() {
stroke(255);
strokeWeight(0.2);
for(var i=0; i<20; i++)
{
line(0,0,(width/20)*i,height);
line(width,0,(width/20)*(20-i),height);
line(0,height,(width/20)*i,0);
line(width,height,(width/20)*(20-i),0);
}
}