void setup() {
  for (int i = 8; i <= 13; i++) {
    pinMode(i, OUTPUT);
  }
}
void loop() {
  for (int i = 8; i <= 13; i++) {
    digitalWrite(i, HIGH);
    delay(1000);
  }
  // delay(1000);
  for (int i = 8; i <= 13; i++) {
    digitalWrite(i, LOW);
    delay(1000);
  }
}