// Duel LED Chaser
void setup() {
  for (int i=2; i<=13; i++){
    pinMode(i, OUTPUT);
  }
}
uint16_t chaser2=13;
void loop() {
    for (int i=2; i<13; i=i+1){
      allLEDsoff();
      digitalWrite(i, HIGH);
      digitalWrite(chaser2, LOW);
      chaser2--;
      if (chaser2!=7){
        delay(25);
      }
}
for (int i=13; i>2; i=i-1){
  allLEDsoff();
  digitalWrite(i, HIGH);
  digitalWrite(chaser2, LOW);
  chaser2++;
  if (chaser2!=8){
    delay(10);
    }
  }
}
void allLEDsoff(void){
  for (int i=2; i<=13; i++){
    digitalWrite(i, LOW);
  }
}