void setup() {
	pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
	digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  delay(3000);
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  delay(1000);
  digitalWrite(3, LOW);
  digitalWrite(4, HIGH);
  delay(3000);
  digitalWrite(3, HIGH);
  delay(1000);
}