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

  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(13, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(10,HIGH);
  delay(1000);
  digitalWrite(13,LOW);
  digitalWrite(12, LOW);
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  delay(1000);
  // put your main code here, to run repeatedly:

}