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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _intro_text(self):
 """Docstring of the enumeration, formatted for documentation page."""

        try:
            cls_docstring = self._clsdict['__doc__']
        except KeyError:
            cls_docstring = ''

        if cls_docstring is None:
            return ''

        return textwrap.dedent(cls_docstring).strip()