int pinArray[] = {2,3,4,5,6,7,8};

int multiArray[][10] = {
  {2,3,4,5,6,8}, //0
  {3,4}, //1
  {2,3,5,6,7}, //2
  {2,3,4,5,7}, //3
  {3,4,7,8}, //4
  {2,4,5,7,8}, //5
  {2,4,5,6,7,8}, //6
  {2,3,4}, //7
  {2,3,4,5,6,7,8}, //8
  {2,3,4,5,7,8}, //9
};
void setup() {
  for(int8_t i = 0; i < sizeof(pinArray)/sizeof(pinArray[0]); i++){
    pinMode(pinArray[i], OUTPUT);
  }
  Serial.begin(9600);
}

void loop() {
  
  for (int a = 0; a < sizeof(multiArray)/sizeof(multiArray[0]); a++){
    for(int i = 0; i < sizeof(multiArray[a])/2; i++){
      Serial.println(i);
      digitalWrite(multiArray[a][i], HIGH);
    }
    delay(1000);
    for (int b = 0; b < sizeof(pinArray); b++){
        digitalWrite(pinArray[b], LOW);
    }
  }
}