void setup()
{
pinMode(13, OUTPUT);
}

void loop()
{
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);

digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
delay(1000);

digitalWrite(11, HIGH);
delay(1000);
digitalWrite(11, LOW);
delay(1000);

digitalWrite(10, HIGH);
delay(1000);
digitalWrite(10, LOW);
delay(1000);

digitalWrite(9, HIGH);
delay(1000);
digitalWrite(9, LOW);
delay(1000);


}