def in_old_hangul_jamo(cp, ucd):
    """Code points for all conjoining Hangul Jamo (Leading Jamo, Vowel Jamo,
    and Trailing Jamo).

    Args:
        cp (int): Code point.
        ucd (UnicodeData): Unicode character database.

    Returns:
        bool: True if `cp` is in set.
    """
    return ucd.old_hangul_jamo(cp)
