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function setup() {
createCanvas(350, 200);
background(255);
}
function draw() {
var w = 80;
stroke(10);
for (var x = 100; x < width; x += 100) {
for (var w = 80; w > 0; w -= 20){
fill(w+w);
ellipse(x, height/2, w, w);
}
}
}