void setup() 
{
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);

}

void loop()
{

 digitalWrite(12, HIGH);
 
   for(int x=0;x<100;x++)

 digitalWrite(10, HIGH);

   for(int x=0;x<100;x++)

{
  digitalWrite(13, HIGH);
    delay(5);

  digitalWrite(13, LOW);
    delay(5);

  digitalWrite(11, HIGH);
    delay(5);

  digitalWrite(11, LOW);
    delay(5);
}    


  digitalWrite(12, LOW);
 
  digitalWrite(10, LOW);

   for(int x=0;x<100;x++)
{

  digitalWrite(13, HIGH);
    delay(5);
  
  digitalWrite(13, LOW);
    delay(5);

  digitalWrite(11, HIGH);
  delay(5);
  digitalWrite(11, LOW);
  delay(5);
}
}