void setup() {
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);

}

void loop() {
  digitalWrite(9,HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(11, LOW);
  delay(500);
  digitalWrite(9, LOW);
  delay(500);
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(10, LOW);
  delay(500);
  digitalWrite(9, HIGH);
  delay(500);
  

}