void setup() {
  for(int i=2;i<14;i++){
    pinMode(i, OUTPUT);
  }
}

void loop() {
   for(int i = 2;i<14;i++){
    digitalWrite(i, 0);
  }

  digitalWrite(13,1);
  digitalWrite(2,1);
  digitalWrite(5,1);
  digitalWrite(8,1);

  int j = 12;
  int k = 12;
  for(int i = 0; i<4 ;i++){
    if (j != 12){
      digitalWrite(j,1);
      digitalWrite(k-1,0);
      delay(1800);
    }
  
    digitalWrite(j+1,1);
    digitalWrite(k,0);
    delay(3800); 
    
    digitalWrite(j,1);
    digitalWrite(k+1,0);
    delay(1800); 

    digitalWrite(j-1,1);
    digitalWrite(k,0);
    delay(800);

    if(j == 3){
      digitalWrite(12,1);
      digitalWrite(11,0);
      delay(800);
    }
    j -= 3;
    k -= 3;
  }
}