void setup() {
  // put your setup code here, to run once:
  pinMode(19, OUTPUT); pinMode(18, OUTPUT); pinMode(5, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(5, HIGH);
  digitalWrite(18, LOW);
  digitalWrite(19, LOW);

  delay(1000);

  digitalWrite(18, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(19, LOW);

  delay(1000);

  digitalWrite(19, HIGH);
  digitalWrite(18, LOW);
  digitalWrite(5, LOW);

  delay(1000);

  digitalWrite(5, HIGH);
  digitalWrite(18, HIGH);
  digitalWrite(19, LOW);
  
  delay(1000);

  digitalWrite(5, HIGH);
  digitalWrite(19, HIGH);
  digitalWrite(18, LOW);

  delay(1000);

  digitalWrite(18, HIGH);
  digitalWrite(19,HIGH);
  digitalWrite(5, LOW);

  delay(1000);

  digitalWrite(18, HIGH);
  digitalWrite(19, HIGH);
  digitalWrite(5, HIGH);

  delay(1000);

}