public static byte[] generateRandomNumbers2(int count, int range) {
   checkArgument(count, range);
   byte[] bytes = new byte[range];
   Set<Integer> set = new HashSet<Integer>(count);
   while (true) {
     set.add(GenerateRandomNumber.generateRandomNumbers(range));
     if (set.size() == count) {
       for (int i : set) {
         bytes[i] = 1;
       }
       return bytes;
     }
   }
 }
 public static byte[] generateRandomNumbers(int count, int range) {
   checkArgument(count, range);
   byte[] randomNumbers = new byte[range];
   int num = 0;
   while (true) {
     int index = GenerateRandomNumber.generateRandomNumbers(range);
     if (randomNumbers[index] == 0) {
       ++num;
     }
     randomNumbers[index] += 1;
     if (num == count) {
       return randomNumbers;
     }
   }
 }