byte LED[] {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
//---------------------------------------------------------
void setup() {
  for (int i = 0; i < 10; i++)
  {
    pinMode(LED[i], OUTPUT);
  }
}
//---------------------------------------------------------
void loop() {
  for (int i = 0; i < 10; i++)
  {
    digitalWrite(LED[i], HIGH);
    delay(500);
  }
  for (int i = 0; i < 10; i++)
  {
    digitalWrite(LED[i], LOW);
    delay(500);
  }
  for (int i = 0; i < 10; i++)
  {
    digitalWrite(LED[i], HIGH);
    delay(500);
    digitalWrite(LED[i], LOW);
  }
}