void setup() {
  // Initialize pins as outputs
  for (int pin = 1; pin <= 12; pin++) {
    pinMode(pin, OUTPUT);
  }

  // Set initial state of LEDs
  digitalWrite(3, HIGH); // A (Utara)
  digitalWrite(6, HIGH); // B (Timur)
  digitalWrite(9, HIGH); // C (Selatan)
  digitalWrite(12, HIGH); // D (Barat)
}

void loop() {

  // Direction A (Utara)
  digitalWrite(3, LOW);
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2, LOW);
  digitalWrite(1, HIGH);
  delay(1000);
  digitalWrite(1, LOW);
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);

  // Direction B (Timur)
  digitalWrite(6, LOW);
  digitalWrite(5, HIGH);
  delay(1000);
  digitalWrite(5, LOW);
  digitalWrite(4, HIGH);
  delay(1000);
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  delay(1000);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);

  // Direction C (Selatan)
  digitalWrite(9, LOW);
  digitalWrite(8, HIGH);
  delay(1000);
  digitalWrite(8, LOW);
  digitalWrite(7, HIGH);
  delay(1000);
  digitalWrite(7, LOW);
  digitalWrite(8, HIGH);
  delay(1000);
  digitalWrite(8, LOW);
  digitalWrite(9, HIGH);

  // Direction D (Barat)
  digitalWrite(12, LOW);
  digitalWrite(11, HIGH);
  delay(1000);
  digitalWrite(11, LOW);
  digitalWrite(10, HIGH);
  delay(1000);
  digitalWrite(10, LOW);
  digitalWrite(11, HIGH);
  delay(1000);
  digitalWrite(11, LOW);
  digitalWrite(12, HIGH);
}