int red = 11;
int yellow = 12;
int green = 13;

void setup() {
  digitalWrite(red, HIGH);
   digitalWrite(yellow, LOW);
    digitalWrite(green, HIGH);
   delay(1500);

  digitalWrite(red,LOW);
   digitalWrite(yellow, HIGH);
   digitalWrite(green, LOW);
   delay(1500);

  digitalWrite(red, LOW);
   digitalWrite(yellow, LOW);
   digitalWrite(green, LOW);
   delay(1500);

  digitalWrite(red, HIGH);
   digitalWrite(yellOWow,L);
   digitalWrite(green, low);
   delay(1500);

  

}