int pin[] = {12,14,27,26,25};
void setup() {
  for(int i = 0 ; i <= 4 ; i++){
    pinMode(pin[i], OUTPUT);
  }
}
void loop() {
  for(int i = 0 ; i <= 4 ; i++){
    digitalWrite(pin[i], HIGH);
    digitalWrite(pin[i+1], HIGH);
    delay(500);
    digitalWrite(pin[i], LOW);
    digitalWrite(pin[i+1], LOW);
    delay(500);
  } 
  for(int i = 0 ; i <= 4 ; i++){
    digitalWrite(pin[i], HIGH);
    digitalWrite(pin[i+1], HIGH);
    delay(500);
    digitalWrite(pin[i], LOW);
    digitalWrite(pin[i+1], LOW);
    delay(500);
  } 
}