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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 start_paragraph(self, stylename=None):
 """Start a new paragraph."""

        # Use the next paragraph style if one was set.
        if stylename is None:
            stylename = self._next_p_style or 'normal-paragraph'
        self.start_container(P, stylename=stylename)