#define led1 27
#define led2 32
#define led3 33
#define led4 25
#define led5 18
#define led6 5
#define led7 17
#define led8 4

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led7, OUTPUT);
  pinMode(led8, OUTPUT);
}

void loop() {
  digitalWrite(led4, HIGH);
  digitalWrite(led5, HIGH);
  delay(500);

  digitalWrite(led3, HIGH);
  digitalWrite(led6, HIGH);
  delay(500);

  digitalWrite(led2, HIGH);
  digitalWrite(led7, HIGH);
  delay(500);


  digitalWrite(led1, HIGH);
  digitalWrite(led8, HIGH);
  delay(500);

  digitalWrite(led1, LOW);
  digitalWrite(led8, LOW);
  delay(500);

  digitalWrite(led2, LOW);
  digitalWrite(led7, LOW);
  delay(500);

  digitalWrite(led3, LOW);
  digitalWrite(led6, LOW);
  delay(500);

  digitalWrite(led4, LOW);
  digitalWrite(led5, LOW);
  delay(500);


}