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function setup() {
createCanvas(900, 900);
background(255);
}
function draw() {
let xpos = random (0,900);
let ypos = random (0,900);
k =random(0,255);
m =random(0,255);
y =random(0,255);
fill(k, y, m);
rect(xpos, ypos, 40,40);
fill (255);
rect(xpos+10, ypos+10, 20, 20);
}