void setup() {
  int y = 13;
  while (y >= 8) {
  delay(50);
  pinMode(y, OUTPUT);
  y = y - 1;
  }
}


void loop() {
  ltor();
  rtol();
  xxx();
  yyy();
  blue();
  red();
  green();
  green();
  red();
  blue();
}

void ltor() {
  int left = 13;
  while ( left >= 8) {
    digitalWrite(left, 1);
    delay(50);
    digitalWrite(left, 0);
    delay(50);
    left = left - 1;
  }
}

void rtol() {
  int a = 8;
  while (a <= 13) {
    digitalWrite(a, 1);
    delay(50);
    digitalWrite(a, 0);
    delay(50);
    a = a + 1;
  }
}

void xxx(){
  int b = 13;
  while (b >= 8) {
    digitalWrite(b, 1);
    b = b - 1;
  }
  delay(100);
}

void yyy(){
  int y1 = 13;
  while (y1 >= 8) {
    digitalWrite(y1, 0);
    y1 = y1 - 1;
  }
  delay(100);
}

void blue(){
digitalWrite(13, 1);
  digitalWrite(8, 1);
  digitalWrite(13, 0);
  digitalWrite(8, 0);
  delay(500);
}

void red(){
digitalWrite(12, 1);
digitalWrite(9, 1);
digitalWrite(12, 0);
digitalWrite(9, 0);
delay(500);
}

void green(){
digitalWrite(11, 1);
digitalWrite(10, 1);
digitalWrite(11, 0);
digitalWrite(10, 0);
delay(500);
}