void setup() {
  for (int pin = 3; pin <=10; pin++) {
    pinMode(pin, OUTPUT);
  }
}

void function1() {
  int pin_bawah = 0;
  do {
    digitalWrite(10 - pin_bawah, HIGH);
    delay(800);
    digitalWrite(10 - pin_bawah, LOW);
    pin_bawah++;
  } while (pin_bawah <=3);
  
  int pin_atas = 0;
  while (pin_atas <=3) {
    digitalWrite(3 + pin_atas, HIGH);
    delay(800);
    digitalWrite(3 + pin_atas, LOW);
    pin_atas++;
  }
}

void function2() {
  for (int pin = 0; pin <=3; pin++) {
    digitalWrite(10 - pin, HIGH);
    digitalWrite(3 + pin, HIGH);
    delay(800);
    digitalWrite(10 - pin, LOW);
    digitalWrite(3 + pin, LOW);
  }
}

void function3() {
  int urutan_nyala[] = {3, 8, 5, 10, 6, 9, 4, 7};
  int led = 0;
  while (led <=7) {
    digitalWrite(urutan_nyala[led], HIGH);
    delay(800);
    digitalWrite(urutan_nyala[led], LOW);
    led++;
  }
}

void loop() {
  function1();
  delay(1000);
  function2();
  delay(1000);
  function3();
  delay(1000);
}