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

void loop() {
  int sos[] = {0,0,0,2,1,1,1,2,0,0,0}; // the individual flashes
  int i; // defines i which will be used as the stopping point in the for loop
  for (i = 0; i<9; i++) { // i is iterated on.
    if (sos[i] == 0) { // if the position i in the sos array is 0, produces short 
      digitalWrite(13, HIGH);
      delay(300);
      digitalWrite(13, LOW);
      delay(500);
    }
    else if (sos[i] == 1){ //if the position i in the sos array is 1, produces long
      digitalWrite(13, HIGH);
      delay(1000);
      digitalWrite(13, LOW);
      delay(500);
    }
    else if (sos[i] == 2){
      delay(500);
    }
  }
}