int jie[] = {13, 12, 11, 10, 9, 8};
int blue = 6;
int red = 200;

void balik2x() {
  for (int i = 0; i < blue; i++) {
    digitalWrite(jie[i], HIGH);
    delay(red);
    digitalWrite (jie[i], LOW);
    delay(red);
  }

  for (int i = blue - 1; i >= 0; i--) {
    digitalWrite(jie[i], HIGH);
    delay(red);
    digitalWrite(jie[i], LOW);
    delay(red);
  }
}

void baylo2x() {
  for (int i = 0; i < blue; i++2) {
    digitalWrite(jie[i], HIGH);
    delay(red);
    digitalWrite(jie[i], LOW);
    delay(red);
  }

  for (int i = blue - 1; i >= 0; i--2) {
    digitalWrite(jie[i], HIGH);
    delay(red);
    digitalWrite(jie[i], LOW);
    delay(red);
  }
}


void setup() {
  for (int i = 0; i < blue; i++) {
    pinMode(jie[i], OUTPUT);
  }
}

void loop() {
  //balik2x();
  baylo2x();
}