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function setup() {
createCanvas(windowWidth, windowHeight);
frameRate(5);
}
function draw() {
background(0);
for(let x=30; x<width ; x+=90){
for(let y=30; y<height; y+=90){
fill(0);
stroke(255,0,0, random(255));
rect(x,y,80,80);
}
}
}