#include <Arduino.h>

const uint8_t PINS[11] = {2,3,4,5,6,7,8,9,10,11,12};

struct Pair { uint8_t hi, lo; };

// First 44 LED pairs (you can rearrange as you wire)
const Pair LEDS[44] = {
  {0,1},{0,2},{0,3},{0,4},{0,5},{0,6},{0,7},{0,8},{0,9},{0,10},   // 10 LEDs from pin D2
  {1,0},{1,2},{1,3},{1,4},{1,5},{1,6},{1,7},{1,8},{1,9},{1,10},   // 10 LEDs from pin D3
  {2,0},{2,1},{2,3},{2,4},{2,5},{2,6},                            // 6 LEDs from pin D4
  {3,0},{3,1},{3,2},{3,4},{3,5},{3,6},                            // 6 LEDs from pin D5
  {4,0},{4,1},{4,2},{4,3},{4,5},{4,6},                            // 6 LEDs from pin D6
  {5,0},{5,1},{5,2},{5,3}                                         // 4 LEDs from pin D7
  // = 44 total
};

void setHighZ() {
  for (int i=0; i<11; i++) pinMode(PINS[i], INPUT);
}

void lightLED(Pair p) {
  setHighZ();
  pinMode(PINS[p.hi], OUTPUT);
  pinMode(PINS[p.lo], OUTPUT);
  digitalWrite(PINS[p.hi], HIGH);
  digitalWrite(PINS[p.lo], LOW);
}

void setup() {}

void loop() {
  for (int i=0; i<44; i++) {
    lightLED(LEDS[i]);
    delay(50); // test: lights each LED one by one
  }
}