int led = 6;

void setup() {
  for (led = 6; led < 14; led++) {
    pinMode(led, OUTPUT);
  }
}

void loop() {
  // Menyalakan semua LED
  for (led = 6; led < 14; led++) {
    digitalWrite(led, HIGH);
    delay(1000);
  }

  // Mematikan semua LED
  for (led = 6; led < 14; led++) {
    digitalWrite(led, LOW);
  }

  // Menghentikan pengulangan
  while (true) {
    // Tidak melakukan apa-apa
  }
}