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function setup() {
createCanvas(windowWidth, windowHeight);
background(100);
frameRate(5);
}
function draw() {
background (random(100));
for(i=10; i<height; i+=30)
{
for(j=10; j<width; j+=30)
{
r=random(50)
fill(random(255));
ellipse(j, i, r, r);
}
}
}