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4861206c6c6f					

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      static byte[] HexToBytes(string hexStream)
    {
      byte[] result = new byte[hexStream.Length / 2 - hexStream.Length % 2];

      for (int i = 0; i < result.Length; i++) {
        result[i] = byte.Parse(hexStream.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber);
      }

      return result;
    }