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function setup() {
createCanvas(windowWidth, windowHeight);
background(100);
frameRate(5);
}
function draw() {
background (100);
for(y=0; y<height; y+=30)
{
for(x=0; x<width; x+=30)
{
r = random(50)
fill(random(255));
ellipse(x, y, r, r);
}
}
}