void setup() {
  // put your setup code here, to run once:
  for(int pin=2;pin<=7;pin++)
  {
    pinMode(pin,OUTPUT);
  }

}

void loop() {
  // put your main code here, to run repeatedly:
  for(int pin=2;pin<=7;pin++)
  {
    digitalWrite(pin, HIGH);
    delay(100);
    digitalWrite(pin, LOW);
    delay(100);
  }

}