void setup() {
  pinMode(25, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(22, OUTPUT);
  pinMode(21, OUTPUT);
  pinMode(16, OUTPUT);
}

void loop() {
  digitalWrite(25, HIGH);
  digitalWrite(16, HIGH);
  digitalWrite(27, LOW);
  digitalWrite(13, LOW);
  digitalWrite(22, LOW);
  digitalWrite(21, LOW);
  delay(1000);

  digitalWrite(27, HIGH);
  digitalWrite(21, HIGH);
  digitalWrite(25, LOW);
  digitalWrite(13, LOW);
  digitalWrite(22, LOW);
  digitalWrite(16, LOW);
  delay(1000);

  digitalWrite(13, HIGH);
  digitalWrite(22, HIGH);
  digitalWrite(25, LOW);
  digitalWrite(27, LOW);
  digitalWrite(21, LOW);
  digitalWrite(16, LOW);
  delay(1000);

  digitalWrite(27, HIGH);
  digitalWrite(21, HIGH);
  digitalWrite(25, LOW);
  digitalWrite(13, LOW);
  digitalWrite(22, LOW);
  digitalWrite(16, LOW);
  delay(1000);

}