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var offset =0;
function setup() {
createCanvas(400, 400);
}
function draw() {
background(0);
strokeWeight(4);
stroke(255);
//loop function
for(var x=0;x<width;x+=50){
fill(random(255),0,random(255));
ellipse(x+offset,200,25,25);
}
offset=offset+1;
}