#define A 9
#define B 10
#define C 11
#define CC 3
#define BB 5
#define AA 6
#define DELAY 50
#define STEPS 6

void setup() {
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(AA, OUTPUT);
  pinMode(BB, OUTPUT);
  pinMode(CC, OUTPUT);

  Serial.begin(115200);
}

void set(int x, int y) {
  switch (x) {
    case AA: digitalWrite(AA, 1); break;
    case BB: digitalWrite(BB, 1); break;
    case CC: digitalWrite(CC, 1); break;
  }
  switch (y) {
    case A: digitalWrite(A, 1); break;
    case B: digitalWrite(B, 1); break;
    case C: digitalWrite(C, 1); break;
  }

  delay(1);

  switch (x) {
    case AA: digitalWrite(BB, 0); digitalWrite(CC, 0); break;
    case BB: digitalWrite(AA, 0); digitalWrite(CC, 0); break;
    case CC: digitalWrite(AA, 0); digitalWrite(BB, 0); break;
  }
  switch (y) {
    case A: digitalWrite(B, 0); digitalWrite(C, 0); break;
    case B: digitalWrite(A, 0); digitalWrite(C, 0); break;
    case C: digitalWrite(A, 0); digitalWrite(B, 0); break;
  }
}

int currStep = 0;
void loop() {
  switch (currStep) {
    case 0: set(CC, A); break;
    case 1: set(CC, B); break;
    case 2: set(AA, B); break;
    case 3: set(AA, C); break;
    case 4: set(BB, C); break;
    case 5: set(BB, A); break;
  }

  currStep += 1;
  if (currStep >= STEPS)
    currStep = 0;
  delay(DELAY);
}