/// <summary>
/// The get alphabet.
/// </summary>
/// <param name="sequenceId">
/// The sequence id.
/// </param>
/// <returns>
/// The <see cref="Alphabet"/>.
/// </returns>
private Alphabet GetAlphabet(long sequenceId)
{
long[] elements = Db.GetAlphabetElementIds(sequenceId);
return(ElementRepository.ToLibiadaAlphabet(elements));
}