const int a1 = 3;
const int a2 = 4;
const int a3 = 5;

const int c1 = 6;
const int c2 = 7;
const int c3 = 8;



void setup() {
  pinMode (a1, OUTPUT);
  pinMode (a2, OUTPUT);
  pinMode (a3, OUTPUT);
  pinMode (c1, OUTPUT);
  pinMode (c2, OUTPUT);
  pinMode (c3, OUTPUT);

}


void loop() {
    light1234();
}

void light1(){
    digitalWrite(a1, HIGH);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(c1, LOW);
    digitalWrite(c2, HIGH);
    digitalWrite(c3, HIGH);
}

void light2() {
    digitalWrite(a1, HIGH);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(c1, HIGH);
    digitalWrite(c2, LOW);
    digitalWrite(c3, HIGH);
}

void light3() {
    digitalWrite(a1, HIGH);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(c1, HIGH);
    digitalWrite(c2, HIGH);
    digitalWrite(c3, LOW);
}

void light4() {
    digitalWrite(a1, LOW);
    digitalWrite(a2, HIGH);
    digitalWrite(a3, LOW);
    digitalWrite(c1, LOW);
    digitalWrite(c2, HIGH);
    digitalWrite(c3, HIGH);
}

void light5() {
    digitalWrite(a1, LOW);
    digitalWrite(a2, HIGH);
    digitalWrite(a3, LOW);
    digitalWrite(c1, HIGH);
    digitalWrite(c2, LOW);
    digitalWrite(c3, HIGH);
}

void light6() {
    digitalWrite(a1, LOW);
    digitalWrite(a2, HIGH);
    digitalWrite(a3, LOW);
    digitalWrite(c1, HIGH);
    digitalWrite(c2, HIGH);
    digitalWrite(c3, LOW);
}

void light7() {
    digitalWrite(a1, LOW);
    digitalWrite(a2, LOW);
    digitalWrite(a3, HIGH);
    digitalWrite(c1, LOW);
    digitalWrite(c2, HIGH);
    digitalWrite(c3, HIGH);
}

void light8() {
    digitalWrite(a1, LOW);
    digitalWrite(a2, LOW);
    digitalWrite(a3, HIGH);
    digitalWrite(c1, HIGH);
    digitalWrite(c2, LOW);
    digitalWrite(c3, HIGH);
}

void light9() {
    digitalWrite(a1, LOW);
    digitalWrite(a2, LOW);
    digitalWrite(a3, HIGH);
    digitalWrite(c1, HIGH);
    digitalWrite(c2, HIGH);
    digitalWrite(c3, LOW);
}

void light12(){
  digitalWrite(a1, HIGH);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(c1, LOW);
    digitalWrite(c2, LOW);
    digitalWrite(c3, HIGH);
}

void light123(){
    digitalWrite(a1, HIGH);
    digitalWrite(a2, LOW);
    digitalWrite(a3, LOW);
    digitalWrite(c1, LOW);
    digitalWrite(c2, LOW);
    digitalWrite(c3, LOW);
}

void light1234() {
    digitalWrite(a1, HIGH); // Required for LEDs 1, 2, 3
    digitalWrite(a2, HIGH); // Required for LED 4
    digitalWrite(a3, LOW);  // Ensure LEDs 7, 8, 9 are off

    // The challenge is in setting c1, c2, and c3 correctly
    // We need to ensure that LEDs 5, 6 are off while 1, 2, 3, 4 are on
    digitalWrite(c1, HIGH); // Turns off LED 2 and 3
    digitalWrite(c2, HIGH); // Turns off LED 1 and 4
    digitalWrite(c3, HIGH); // Turns off LED 1 and 2
}