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function setup() {
createCanvas(400, 400);
background(255,255,255);
}
function draw() {
let r1 = random(100,400);
let r2 = random(100,400);
let r = map(r1,100,400,0,255);
let g = map(r1,100,400,0,255);
stroke(r,0,255);
fill(0,g,255);
ellipse(200,0,r1,r1);
ellipse(200,400,r2,r2);
}