//these are the global variables 
int Led_pin[14] = { 13 , 12 , 11 , 10 , 9 , 8 , 7 , 6 , 5 , 4 , 3 , 2 , 1 , 0};
int Delaylength = 100;

void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i = 0; i<14; i++){
      digitalWrite(Led_pin[i] , HIGH);
      delay(Delaylength);
      digitalWrite(Led_pin[i] , LOW);
  }
}