// Declare the pins for the LEDs
int ledPins[17] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};

// Declare the variables for the chasing LEDs
int currentLED = 0;
int delayTime = 1000;

void setup() {
  // Set the pins for the LEDs as outputs
  for (int i = 0; i < 17; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void chaseLEDs(int start, int end, int step) {
  // Chase LEDs forward
  for (int i = start; i <= end; i += step) {
    digitalWrite(ledPins[i], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[i], LOW);
  }

  // Chase LEDs backward
  for (int i = end; i >= start; i -= step) {
    digitalWrite(ledPins[i], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[i], LOW);
  }
}

void loop() {
  // Chase even-numbered LEDs forward and backward
  chaseLEDs(0, 15, 2);

  // Chase odd-numbered LEDs forward and backward
  chaseLEDs(1, 16, 2);

  // Blink all LEDs twice
  for (int j = 0; j < 2; j++) {
    for (int i = 0; i < 17; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(delayTime);
    for (int i = 0; i < 17; i++) {
      digitalWrite(ledPins[i], LOW);
    }
    delay(delayTime);
  }

  // Blink odd-numbered LEDs twice
  for (int j = 0; j < 2; j++) {
    for (int i = 1; i < 17; i += 2) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(delayTime);
    for (int i = 1; i < 17; i += 2) {
      digitalWrite(ledPins[i], LOW);
    }
    delay(delayTime);
  }

  // Blink even-numbered LEDs twice
  for (int j = 0; j < 2; j++) {
    for (int i = 0; i < 17; i += 2) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(delayTime);
    for (int i = 0; i < 17; i += 2) {
      digitalWrite(ledPins[i], LOW);
    }
    delay(delayTime);
  }
}