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function setup(){
w = min(windowWidth, windowHeight);
createCanvas(w, w);
strokeWeight(4);
pad = w/10;
spc = 25;
rectMode(CENTER)
noFill()
strokeWeight(2)
}
function draw(){
background(0)
stroke(255)
for (x = pad; x < w - pad; x += spc) {
for (y = pad; y < w - pad; y += spc) {
rect(x, y, spc, spc)
}
}
noLoop()
}