void setup() {
  // put your setup code here, to run once:
pinMode(11,OUTPUT);
pinMode(12,OUTPUT);
pinMode(13,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(11, HIGH);
digitalWrite(12,LOW);
digitalWrite(13, LOW);
delay(1500);

digitalWrite(11,LOW);
digitalWrite(12,HIGH);
digitalWrite(13, LOW);
delay(1500);

digitalWrite(11, LOW);
digitalWrite(12,LOW);
digitalWrite(13, HIGH);
delay(1500);

digitalWrite(11, LOW);
digitalWrite(12,LOW);
digitalWrite(13, LOW);
delay(1500);

digitalWrite(11, HIGH);
digitalWrite(12,HIGH);
digitalWrite(13, HIGH);
delay(1500);

}