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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 add(self, itm, **options):
 """ Convenience method to add an item together with a series of options. :param itm: The item to add :param options: keyword arguments which will be placed in the item's option entry. If the item already exists, it (and its options) will be overidden. Use :attr:`dict` instead to update options """

        if not options:
            options = None
        self._d[itm] = options