int i, led[]={8,9,10,11,12,13},
  led2[]={13,12,11,10,9,8},
  led3[]={8,10,12},
  led4[]={9,11,13};

void setup() {
    for(i=0; i<=5; i++){
    pinMode(led[i], OUTPUT);
    pinMode(led2[i], OUTPUT);
    pinMode(led3[i], OUTPUT);
    pinMode(led4[i], OUTPUT);
  }
}

int tunggu = 200, tunggu2 = 100;
void loop() {
  //projec ke 1
  for(int ulang=0; ulang<=2; ulang++){
    digitalWrite(led[i]), HIGH;
    delay(tunggu);
    digitalWrite(led[i], LOW);
  }
  for(i=5; i>=0; i--){
    digitalWrite(led[i], HIGH);
    delay(tunggu);
    digitalWrite(led[i], LOW);
  }
}
//projec ke 2
  for(int j=0; j<=2; j++) {
    for(i=0; i<=2; i++){
      digitalWrite(led[i], HIGH);
      digitalWrite(led2[i], HIGH);
      delay(tunggu);
      digitalWrite(led[i], LOW);
      digitalWrite(led2[i], LOW);
    }
    for(i=2; i>=0; i--){
      digitalWrite(led[i], HIGH);
      digitalWrite(led2[i], HIGH);
      delay(tunggu);
      digitalWrite(led[i], LOW);
      digitalWrite(led2[i], LOW);
    }
  }
  //projec ke 3