void setup(*args) {
  // put your setup code here, to run once:
  // pinMode(2, OUTPUT);
  // pinMode(3, OUTPUT);
  // pinMode(4, OUTPUT);
  // pinMode(5, OUTPUT);
  // pinMode(6, OUTPUT);
  for (int i=2; i<=6; i++) {
    pinMode(i, OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  // digitalWrite(2, HIGH);
  // delay(100);
  // digitalWrite(3, HIGH);
  // delay(100);
  // digitalWrite(4, HIGH);
  // delay(100);
  // digitalWrite(5, HIGH);
  // delay(100);
  // digitalWrite(6, HIGH);
  // delay(100);

  // digitalWrite(6, LOW);
  // delay(100);
  // digitalWrite(5, LOW);
  // delay(100);
  // digitalWrite(4, LOW);
  // delay(100);
  // digitalWrite(3, LOW);
  // delay(100);
  // digitalWrite(2, LOW);
  // delay(100);

  // for (int i=2; i<=6; i++) {
  //   digitalWrite(i, HIGH);
  //   delay(100);
  // }

  int i=2;
  while (i<=6) {
    digitalWrite(i, HIGH);
    delay(100);
    i++;
  }

  for (int i=6; i>=1; i--) {
    digitalWrite(i, LOW);
    delay(100);
  }
}