code: def sentences(self):
      sentences = (p.sentences for p in self._paragraphs)
      return tuple(chain(*sentences))
  
file_path: sumy/sumy/models/dom/_document.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  from itertools import chain
  from ...utils import cached_property
  from ..._compat import unicode_compatible
label_desc: Use image node_id 3 for calling the ObjectDocumentModel obj's underlying member method code with example usage: obj.sentences() and returns: tuple