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, HIGH);
  delay(500);
  digitalWrite(i, LOW);
  delay(500);
}
delay(500);
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
delay(500);
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(7, LOW);
digitalWrite(8, LOW);
digitalWrite(9, LOW);
delay(500);
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(9, LOW);
delay(500);
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
digitalWrite(6, HIGH);
digitalWrite(8, HIGH);
digitalWrite(7, HIGH);
delay(500);
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
digitalWrite(5, LOW);
digitalWrite(6, LOW);
digitalWrite(8, LOW);
digitalWrite(7, LOW);
delay(500);
for(i = 9;i>=2;i--)
{
  digitalWrite(i, HIGH);
  delay(500);
  digitalWrite(i, LOW);
  delay(500);
}


}