void setup() {
  // put your setup code here, to run once:
pinMode (8,OUTPUT );
pinMode (9, OUTPUT );
pinMode (10,OUTPUT );
pinMode (11,OUTPUT );
pinMode (12,OUTPUT );
pinMode (13,OUTPUT );

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (13,HIGH );
delay (100);
digitalWrite  (13, LOW );
delay (50);
digitalWrite (12,HIGH );
delay (100);
digitalWrite (12, LOW );
delay (50);
digitalWrite (11, HIGH );
delay (100);
digitalWrite (11, LOW );
delay (50);
digitalWrite (10, HIGH );
delay (100);
digitalWrite(10, LOW  );
delay (50);
digitalWrite (9, HIGH );
delay (100);
digitalWrite (9, LOW );
delay (50);
digitalWrite (8, HIGH );
delay (100);
digitalWrite (8, LOW );
delay (50);
}