void setup() {
  for (int pin = 2; pin <= 9; pin++) {
    pinMode(pin, OUTPUT);
  }
}

void loop() {
  int ulang = 0;

  do {
    // tepi ke tengah
    digitalWrite(2, HIGH);
    digitalWrite(9, HIGH);
    delay(150);
    digitalWrite(2, LOW);
    digitalWrite(9, LOW);

    digitalWrite(3, HIGH);
    digitalWrite(8, HIGH);
    delay(150);
    digitalWrite(3, LOW);
    digitalWrite(8, LOW);

    digitalWrite(4, HIGH);
    digitalWrite(7, HIGH);
    delay(150);
    digitalWrite(4, LOW);
    digitalWrite(7, LOW);

    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    delay(150);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);

    delay(200); 

    // tengah ke tepi
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    delay(150);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);

    digitalWrite(4, HIGH);
    digitalWrite(7, HIGH);
    delay(150);
    digitalWrite(4, LOW);
    digitalWrite(7, LOW);

    digitalWrite(3, HIGH);
    digitalWrite(8, HIGH);
    delay(150);
    digitalWrite(3, LOW);
    digitalWrite(8, LOW);

    digitalWrite(2, HIGH);
    digitalWrite(9, HIGH);
    delay(150);
    digitalWrite(2, LOW);
    digitalWrite(9, LOW);

    delay(200); 

    ulang++;
  } while (ulang < 4);

  while (true) {}
}