<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def paragraphs(self):
 """ Immutable sequence of |_Paragraph| instances corresponding to the paragraphs in this text frame. A text frame always contains at least one paragraph. """

        return tuple([_Paragraph(p, self) for p in self._txBody.p_lst])