void setup() 
{
pinMode(8,OUTPUT); 
pinMode(11,OUTPUT);
pinMode(13,OUTPUT);
}

void loop() 
{
digitalWrite(8,HIGH);
delay(100);
digitalWrite(8,LOW);
delay(150);
digitalWrite(11,HIGH);
delay(125);
digitalWrite(11,LOW);
delay(175);
digitalWrite(13,HIGH);
delay(160);
digitalWrite(13,LOW);
delay(210);
}