const int numCircles = 3;
const int circlePins[numCircles][4] = {
  {2, 3, 4, 5},  // First circle LEDs
  {6, 7, 8, 9},  // Second circle LEDs
  {10, 11, 12, 13}  // Third circle LEDs
};

void setup() {
  for (int i = 2; i <= 13; i++) {
    pinMode(i, OUTPUT);
  }
  randomSeed(analogRead(0));
}

void loop() {
  // Fast circular crescent pattern with increasing speed until 8 seconds
  unsigned long startTime = millis();
  int delayTime = 100;
  while (millis() - startTime < 8000) {
    for (int i = 0; i < numCircles; i++) {
      int* circle = circlePins[i];
      for (int j = 0; j < 4; j++) {
        digitalWrite(circle[j], HIGH);
        delay(delayTime);  // Delay for the crescent pattern
        digitalWrite(circle[j], LOW);
      }
    }
    delayTime = max(20, delayTime - 10);  // Decrease delayTime for increasing speed, but not below 20ms
  }
  
  // Randomly select a circle and blink it fast
  int chosenCircle = random(0, numCircles);
  int* circle = circlePins[chosenCircle];
  for (int blinkCount = 0; blinkCount < 20; blinkCount++) {  // Blink 20 times
    for (int i = 0; i < 4; i++) {
      digitalWrite(circle[i], HIGH);
    }
    delay(50);  // Very fast delay for the rapid blinking pattern
    for (int i = 0; i < 4; i++) {
      digitalWrite(circle[i], LOW);
    }
    delay(50);  // Very fast delay for the rapid blinking pattern
  }

  // Reset all LEDs
  for (int i = 2; i <= 13; i++) {
    digitalWrite(i, LOW);
  }

  // Delay before the next iteration
  delay(random(500, 2000));  // Random delay between patterns (0.5 to 2 seconds)
}