int leds[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, A0, A1, A2, A3};

void setup() {
    for (int i = 0; i < 16; i++) {
        pinMode(leds[i], OUTPUT);
    }
}

void loop() {
    blink_1();
    blink_2();
    blink_3();
}

void blink_1() {
    int t = 100;
    for (int i = 0; i < 4; i++) {
        setAllLeds(HIGH);
        delay(t);
        setAllLeds(LOW);
        delay(t);
    }
}

void blink_2() {
    int t = 100;
    for (int i = 0; i < 16; i++) {
        digitalWrite(leds[i], HIGH);
        delay(t);
    }
    for (int i = 0; i < 16; i++) {
        digitalWrite(leds[i], LOW);
        delay(t);
    }
}

void blink_3() {
    int t = 80;
    for (int i = 0; i < 16; i++) {
        for (int j = 0; j < 5; j++) {
            digitalWrite(leds[i], HIGH);
            delay(t);
            digitalWrite(leds[i], LOW);
            delay(t);
        }
    }
}

void setAllLeds(int state) {
    for (int i = 0; i < 16; i++) {
        digitalWrite(leds[i], state);
    }
}