## link_to_previous(is_link_to_previous) {#bool} Links or unlinks all headers and footers to the corresponding headers and footers in the previous section. ```python def link_to_previous(self, is_l......assertEqual(2, len(list(filter(lambda hf: not hf.as_header_footer()...count) self.assertEqual(6, len(list(filter(lambda hf: hf.as_header_footer()...