int ledPin[] = {13, 12, 11, 10, 9, 8, 7, 6};
int delayLed = 100;

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < 8; i++) {
    pinMode(ledPin[i], OUTPUT);
  }
}

void loop() {
  tengahKananKiri();

  tepikanankiri();
}




// Deklarasi dan implementasi fungsi tengahKananKiri
void tengahKananKiri() {
  int angkaganjil =1;
  for (int i = 3; i>-1; i--) 
  {
    digitalWrite(ledPin[i], LOW);
    digitalWrite(ledPin[i+angkaganjil], LOW);
    delay(delayLed);
    digitalWrite(ledPin[i], HIGH);
    digitalWrite(ledPin[i+angkaganjil], HIGH);
    delay(delayLed);
    angkaganjil +=2;
  }
}
  void tepikanankiri(){
  int b =7;
  for (int i = 0; i<8; i++)
  {
    digitalWrite(ledPin[i], LOW);
    digitalWrite(ledPin[i+b], LOW);
    delay(delayLed);
    digitalWrite(ledPin[i], HIGH);
    digitalWrite(ledPin[i+b], HIGH);
    delay(delayLed);
     b-=2;
  }

  }