const int ledPins[] = {17, 27, 22, 5};

void setup() {
  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], HIGH);
  }
  delay(5000);
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], LOW);
  }
  delay(5000);
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(7000);
    digitalWrite(ledPins[i], LOW);
  }
  for (int i = 0; i < 4; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(500);
    digitalWrite(ledPins[i], LOW);
    delay(500);
  }

  for (int i = 0; i < 8; i++) {
    digitalWrite(ledPins[i % 2], HIGH);
    delay(500);
    digitalWrite(ledPins[i % 2], LOW);
    delay(500);
  }
}