'Determine which UDL family this style is in. Returns one
of M, CSS, CSL, SSL or TPL.'

@classmethod
def _udl_family_from_style(cls, style):

    idx = bisect.bisect_right(cls._udl_family_start_styles, style)
    start_style = cls._udl_family_start_styles[(idx - 1)]
    fam = cls._udl_family_from_start_style[start_style]
    return fam
