void setup() {pinMode(3, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
}

void loop() {digitalWrite(10, HIGH);
delay(150);
digitalWrite(10, LOW);
digitalWrite(9, HIGH);
delay(150);
digitalWrite(9, LOW);
digitalWrite(3, HIGH);
delay(150);
digitalWrite(3, LOW);
digitalWrite(9, HIGH);
delay(150);
digitalWrite(9, LOW);
digitalWrite(10, HIGH);
}