void setup() {
  // put your setup code here, to run once:
  for (int i = 2; i < 12; i++) {
    pinMode(i, OUTPUT);
  }
}

void loop() {
  for (int i = 2; i < 12; i++) {
    digitalWrite(i, HIGH); // Turn on LED
    delay(100);                     // Wait for 100 milliseconds
    digitalWrite(i, LOW);
  }
}