void setup() {
  // put your setup code here, to run once:
for(int x=1; x<=13; x++)
{pinMode(x, OUTPUT);}
}

void loop() {
  // put your main code here, to run repeatedly:
for(int x=1; x<=13; x++){
  digitalWrite(x, HIGH);
  delay(200);
  digitalWrite(x, LOW);
}
for(int x=13; x>=1; x--){
  digitalWrite(x,HIGH);
  delay(30);
  digitalWrite(x, LOW);
}
}