void setup() {
  // put your setup code here, to run once:
pinMode (13, OUTPUT ) ;
pinMode (12, OUTPUT ) ;
pinMode (11, OUTPUT ) ;
pinMode (10, OUTPUT ) ;
pinMode (9 , OUTPUT ) ;
pinMode (8 , OUTPUT ) ;
pinMode (7 , OUTPUT ) ;
pinMode (6 , OUTPUT ) ;

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (13 , HIGH);
digitalWrite (12 , LOW);
digitalWrite (11 , LOW );
digitalWrite (10 , LOW );
digitalWrite (9  , LOW );
digitalWrite (8  , LOW );
digitalWrite (7  , LOW );
digitalWrite (6  , LOW );
delay (500);

digitalWrite (13 , LOW);
digitalWrite (12 , HIGH);
digitalWrite (11 , LOW);
digitalWrite (10 , LOW);
digitalWrite (9  , LOW);
digitalWrite (8  , LOW);
digitalWrite (7  , LOW);
digitalWrite (6  , LOW);
delay (500);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, HIGH);
digitalWrite(10, LOW);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(7, LOW );
digitalWrite(6, LOW);
delay( 500);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
digitalWrite(10, HIGH);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(7, LOW);
digitalWrite(6, LOW);
delay(500);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
digitalWrite(10, LOW);
digitalWrite(9, HIGH);
digitalWrite(8, LOW);
digitalWrite(7, LOW);
digitalWrite(6, LOW);
delay(500);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
digitalWrite(10, LOW);
digitalWrite(9, LOW);
digitalWrite(8, HIGH);
digitalWrite(7, LOW);
digitalWrite(6, LOW);
delay(500);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
digitalWrite(10, LOW);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(7, HIGH);
digitalWrite(6, LOW);
delay(500);

digitalWrite(13, LOW);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
digitalWrite(10, LOW);
digitalWrite(9, LOW);
digitalWrite(8, LOW);
digitalWrite(7, LOW);
digitalWrite(6, HIGH);
delay(500);

}