// #define LED 27
int leds[] = {12, 14, 27, 26, 25, 33};
void setup() {

  for (int i = 0; i < 6; i++) {
    pinMode(leds[i], OUTPUT);
  }

}

void loop() {
  int i, j;
  for ( i = 0, j = 5; i < 3 , j > 2; i++, j--) {
    digitalWrite(leds[i], HIGH);
    digitalWrite(leds[j], HIGH);
    delay(50);
    digitalWrite(leds[i], LOW);
    digitalWrite(leds[j], LOW);
    delay(50);
  }
  for ( i = 2,  j = 3; i >= 0 , j <= 5; i--, j++) {
    digitalWrite(leds[i], HIGH);
    digitalWrite(leds[j], HIGH);
    delay(200);
    digitalWrite(leds[i], LOW);
    digitalWrite(leds[j], LOW);
    delay(200);
  }
}