int ledler[]= {3,5,2,8,6,10,7,4};
int i=0;
void setup(){
  while(i<8)
    pinMode(ledler[i++], OUTPUT);
}
void loop(){
  i=0;
  while(i<8){
    digitalWrite(ledler[i++], HIGH);
    delay(75);
  }
  i=0;
  while(i<8)
    digitalWrite(ledler[i++], LOW);
  delay(750);
  
}