void setup() {
  pinMode(18, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
pinMode(27, OUTPUT);
}

void loop() {
  
  digitalWrite(16, HIGH);
  digitalWrite(15, HIGH);
  digitalWrite(14, HIGH);
  delay(2000);
  digitalWrite(16, LOW);
  digitalWrite(15, LOW);
  digitalWrite(14, LOW);
  delay(4000);
  digitalWrite(15, HIGH);
  delay(2000);
  digitalWrite(15, LOW);
  delay(4000);
  digitalWrite(17, HIGH);
  digitalWrite(16, HIGH);
  digitalWrite(15, HIGH);
  delay(2000);
  digitalWrite(17, LOW);
  digitalWrite(16, LOW);
  digitalWrite(15, LOW);
  delay(4000);
  digitalWrite(18, HIGH);
  digitalWrite(13, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(27, HIGH);
  delay(2000);
   digitalWrite(18, LOW);
  digitalWrite(13,LOW);
  digitalWrite(12, LOW);
  digitalWrite(27, LOW);
  delay(4000);
  digitalWrite(18, HIGH);
   digitalWrite(27, HIGH);
   delay(2000);
   digitalWrite(18, LOW);
   digitalWrite(27, LOW);
  delay(4000);
  digitalWrite(17, HIGH);
  delay(2000);
digitalWrite(17, LOW);
  delay(4000);
  digitalWrite(18, HIGH);
  digitalWrite(27, HIGH);
  delay(2000);
   digitalWrite(18, LOW);
  digitalWrite(27, LOW);
  delay(4000);
  digitalWrite(12, HIGH);
  digitalWrite(27, HIGH);
  delay(2000);
   digitalWrite(12, LOW);
  digitalWrite(27, LOW);
  delay(4000);
}