Unconditionally replace or add *sectPr* as a grandchild in the
        correct sequence.

def set_sectPr(self, sectPr):
        """
        Unconditionally replace or add *sectPr* as a grandchild in the
        correct sequence.
        """
        pPr = self.get_or_add_pPr()
        pPr._remove_sectPr()
        pPr._insert_sectPr(sectPr)