int arr[]=(8,9,10,11,12);
int i;
void setup() {
for(i=0;i<=5;i++)
{
   pinMode(arr[i], OUTPUT);
}

}

void loop() {
for(i=0;i<=5;i++)
{
  digitalWrite(arr[i], HIGH);
  delay(200);
  digitalWrite(arr[i], LOW);
  delay(200);
}
for(i=0;i<=5;i++){
  digitalWrite(arr[i], HIGH);
  delay(200);
  digitalWrite(arr[i], LOW);
  delay(200);
}
for(i=0;i<=5;i++)
{
  digitalWrite(arr[i], HIGH);
  delay(200);
  digitalWrite(arr[i], LOW);
  delay(200);
}
for(i=0;i<=5;i++)
{
  digitalWrite(arr[i], HIGH);
  delay(200);
  digitalWrite(arr[i], LOW);
  delay(200);
}
for(i=0;i<=5;i++)
{
  digitalWrite(arr[i], HIGH);
  delay(200);
  digitalWrite(arr[i], LOW);
  delay(200);
}


}