void setup() {

pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);

}

int on(200);
int off(100);

void loop() {
 
 digitalWrite(13,HIGH);
 delay(on);
 digitalWrite(12,HIGH);
 delay(on);
 digitalWrite(11,HIGH);
 delay(on);
 digitalWrite(10,HIGH);
 delay(on);


 digitalWrite(10,LOW);
 delay(on);
 digitalWrite(11,LOW);
 delay(on);
 digitalWrite(12,LOW);
 delay(on);
 digitalWrite(13,LOW);
 delay(on);

  digitalWrite(13,HIGH);
 delay(on);
  digitalWrite(13,LOW);
 delay(on);
 digitalWrite(11,HIGH);
 delay(on);
 digitalWrite(11,LOW);
 delay(on);
  digitalWrite(12,HIGH);
 delay(on);
 digitalWrite(12,LOW);
 delay(on);

 digitalWrite(13,HIGH);
 delay(on);
  digitalWrite(13,LOW);
 delay(on);
 digitalWrite(10,HIGH);
 delay(on);
 digitalWrite(10,LOW);
 delay(on);
  digitalWrite(11,HIGH);
 delay(on);
 digitalWrite(11,LOW);
 delay(on);
 digitalWrite(12,HIGH);
 delay(on);
 digitalWrite(12,LOW);
 delay(on);

}