int leds[] = {9, 10, 11};

void setup() {
  for (int i = 0; i < 3; i++) {
    pinMode(leds[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(leds[i], HIGH);
    delay(4000);
    digitalWrite(leds[i], LOW);
  }
}

```
int leds[] = {9, 10, 11};
int delays[] = {4000, 3600, 3200, 2800, 2400, 2000, 1600, 1200, 800, 400, 200};

void setup() {
  for (int i = 0; i < 3; i++) {
      pinMode(leds[i], OUTPUT);
        }
        }

        void loop() {
          for (int j = 0; j < 10; j++) {
              for (int i = 0; i < 3; i++) {
                    digitalWrite(leds[i], HIGH);
                        }
                            delay(delays[j]);
                                for (int i = 0; i < 3; i++) {
                                      digitalWrite(leds[i], LOW);
                                          }
                                              delay(400);
                                                }
                                                }
                                                ```