int i;

void setup() 
{
  // put your setup code here, to run once:
  for (i = 2; i <= 9; i++){
    pinMode(i, OUTPUT);
  }
}

void loop() 
{
  // put your main code here, to run repeatedly:
 
  for (i=2; i<=9; i++)
  digitalWrite(i,1);
digitalWrite(11-i,1);
delay(250);
digitalWrite(i,0);
digitalWrite(11-i,0);






}