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

}

void loop() {

 digitalWrite(12,HIGH);
 delay(500);
 digitalWrite(12,LOW);
 delay(500);
 digitalWrite(10,HIGH);
 delay(500);
 digitalWrite(10,LOW);
 digitalWrite(13,HIGH);
 delay(500);
 digitalWrite(13,LOW);
 delay(500);
}
 


}