int delayTimeHigh = 20;
int delayTimeLow = 10;



void setup()
{
  for ( int i = 3; i <= 12; i++)
  {
    pinMode(i , OUTPUT);

  }
}

void loop() {


  for (int i = 0; i <= 10; i++)

  {
    if (i != 10)
    {
      digitalWrite(3, HIGH);
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
      delay(delayTimeHigh);
      digitalWrite(3, LOW);
      digitalWrite(4, LOW);
      digitalWrite(5, LOW);
      delay(delayTimeLow);
    }

    else
    {
      for (int j = 0; j <= 10; j++)

        if (j != 10)
        {
          digitalWrite(6, HIGH);
          digitalWrite(7, HIGH);
          digitalWrite(8, HIGH);
          digitalWrite(9, HIGH);
          delay(delayTimeHigh);
          digitalWrite(6, LOW);
          digitalWrite(7, LOW);
          digitalWrite(8, LOW);
          digitalWrite(9, LOW);
          delay(delayTimeLow);
        }

        else
        {
          for (int k = 0; k <= 9; k++)
          {
            digitalWrite(10, HIGH);
            digitalWrite(11, HIGH);
            digitalWrite(12, HIGH);
            delay(delayTimeHigh);
            digitalWrite(10, LOW);
            digitalWrite(11, LOW);
            digitalWrite(12, LOW);
            delay(delayTimeLow);
          }
        }
    }
  }
}