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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 speaker(self):
 """ Lazy-loads the speaker for this word :getter: Returns the plain string value of the speaker tag for the word :type: str """

        if self._speaker is None:
            speakers = self._element.xpath('Speaker/text()')
            if len(speakers) > 0:
                self._speaker = speakers[0]
        return self._speaker