<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def default(cls, package):
 """ Return a newly created styles part, containing a default set of elements. """

        partname = PackURI('/word/styles.xml')
        content_type = CT.WML_STYLES
        element = parse_xml(cls._default_styles_xml())
        return cls(partname, content_type, element, package)