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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 chain(self):
 """ Add patterns chain, using configuration from this chain :return: :rtype: """

        # pylint: disable=protected-access
        chain = self.rebulk.chain(**self._kwargs)
        chain._defaults = dict(self._defaults)
        chain._regex_defaults = dict(self._regex_defaults)
        chain._functional_defaults = dict(self._functional_defaults)
        chain._string_defaults = dict(self._string_defaults)
        return chain