void setup() {
  pinMode(13, OUTPUT); 
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT); 
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT); 
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT); 
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT); 
  pinMode(4, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  delay(200);           
  digitalWrite(13, LOW);

  digitalWrite(12, HIGH);
  delay(200);           
 digitalWrite(12, LOW);

  digitalWrite(11, HIGH);
  delay(200);           
  digitalWrite(11, LOW);

  digitalWrite(10, HIGH);
  delay(200);           
  digitalWrite(10, LOW);

  digitalWrite(9, HIGH);
  delay(200);           
  digitalWrite(9, LOW);

  digitalWrite(8, HIGH);
  delay(200);           
  digitalWrite(8, LOW);

  digitalWrite(7, HIGH);
  delay(200);           
  digitalWrite(7, LOW);

  digitalWrite(6, HIGH); 
  delay(200);           
  digitalWrite(6, LOW);  

  digitalWrite(5, HIGH); 
  delay(200);           
  digitalWrite(5, LOW);  

  digitalWrite(4, HIGH); 
  delay(200);           
  digitalWrite(4, LOW);  
}