void setup() {
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
}

void loop() {
  for(int x = 0; x < 10; x++){
    switch(x){
      case 0:
      delay(2000);
      break;

      case 1:
      delay(2000);
      break;

      case 2:
      delay(2000);
      break;

      case 3:
      delay(2000);
      break;

      case 4:
      delay(2000);
      break;

      case 5:
      delay(2000);
      break;

      case 6:
      delay(2000);
      break;

      case 7:
      delay(2000);
      break;

      case 8:
      delay(2000);
      break;

      case 9:
      delay(2000);
      break;
    }
  }
}