void setup() {
  // put your setup code here, to run once:

pinMode(13,OUTPUT);
pinMode(12,OUTPUT);
pinMode(11,OUTPUT);
pinMode(10,OUTPUT);
pinMode(9,OUTPUT);
pinMode(8,OUTPUT);
}

 void loop() {
  // put your main code here, to run repeatedly:
  int i;
  for (i=12;i>=9;i--)
{
  digitalWrite(i,HIGH);
 delay(00);
 digitalWrite(i,LOW);
 delay(00);
 }
 for (i=8;i<=13;i++)
 {
   digitalWrite(i,HIGH);
   delay(00);
digitalWrite(i,LOW);
delay(00);
 }
 }