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let x = 200;
let y = 200;
function setup() {
createCanvas(windowWidth, windowHeight);
background(0);
}
function draw() {
noStroke();
fill(random(255),random(255),random(255),127);
ellipse(x, y, 10, 10);
x = x + random (-10,10);
y = y + random (-10,10);
}