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function setup() {
createCanvas(800, 800);
background(0);
stroke(255, 255, 255);
fill (0, 0, 0);
for (let i=0; i < random(15, 25); i++){
let a = random(width);
let b = random(height);
let c = random(19);
for (let j=100; j>random(10,81); j-=20){
ellipse (a, b, j+c, j+c);
}
}
}