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function setup() {
createCanvas(400, 400);
}
function draw() {
background(220);
translate(width / 2, height / 2);
let count = 0;
for (let w = width; w > 0; w -= 25) {
rectMode(CENTER);
if (count % 2 == 0) fill(0);
else fill(255);
let angle = sin(frameCount * 0.01);
rotate(angle);
square(0, 0, w);
count++;
}
}