docs: public static List<Integer> getRandomIntegers(final int start, final int end, final int size) {
          if (size > (end - start + 1)) {
              throw new IllegalArgumentException("The specified size more then (end - start + 1)!");
          }
  
          final List<Integer> integers = genIntegers(start, end);
          final List<Integer> ret = new ArrayList<Integer>();
  
          int remainsSize;
          int index;
  
          while (ret.size() < size) {
              remainsSize = integers.size();
              index = (int) (Math.random() * (remainsSize - 1));
              final Integer i = integers.get(index);
  
              ret.add(i);
              integers.remove(i);
          }
  
          return ret;
      }