void setup() {
  // put your setup code here, to run once:
  for(int LED = 1; LED <= 3; LED++){
    pinMode(LED, OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int LED = 1; LED <= 3; LED++){
    digitalWrite(LED, HIGH);
    delay(200);
    digitalWrite(LED, LOW);
  }

  for(int LED = 1; LED <= 3; LED++){
    digitalWrite(LED, LOW);
    delay(50);
  }

  for(int LED = 3; LED <= 1; LED++){
    digitalWrite(LED, HIGH);
    delay(200);
    digitalWrite(LED, LOW);
  }

  for(int LED = 1; LED <= 3; LED++){
    digitalWrite(LED, HIGH);
    delay(50);
  }
}