def build_ignorables_mapping(copyrights, holders, authors, urls, emails):
    """
    Return a sorted mapping of ignorables built from lists of ignorable clues.
    """
    ignorables = dict(
        ignorable_copyrights=sorted(copyrights or []),
        ignorable_holders=sorted(holders or []),
        ignorable_authors=sorted(authors or []),
        ignorable_urls=sorted(urls or []),
        ignorable_emails=sorted(emails or []),
    )

    return {k: v for k, v in sorted(ignorables.items()) if v}