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function setup() {
createCanvas(windowWidth, windowHeight);
background(255);
let rect_size = 30;
for(let w=0; w<width; w+=rect_size*1.5){
for(let h=0; h < height; h+=rect_size*1.5){
noStroke();
fill(random(255));
rect(w, h, rect_size, rect_size);
}
}
}