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int counter = 0;
PVector pos1 = new PVector(10,10);
PVector pos2 = new PVector(20,10);
PVector pos3 = new PVector(30,10);
PVector pos4 = new PVector(40,10);
void setup(){
frameRate(1);
}

void draw(){
background(0);
if(counter == 0){
ellipse(pos1.x,pos1.y,10,10);
}else if(counter == 1 ){
ellipse(pos2.x,pos2.y,10,10);
}else if(counter == 2){
  ellipse(pos3.x,pos3.y,10,10);
}
counter++;

if(counter > 2){
  counter = 0;

}
}