void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  int pin = 2;
  for(pin = 2; pin = 13; pin++){
    digitalWrite(pin, HIGH);
  }
  delay(10000);
  for(pin = 2; pin = 13; pin++){
    digitalWrite(pin, LOW);    
  }
  delay(10000);
}