[Dennis] enjoys talking to his sister. Her name is [Jennifer]. [Jennifer] is looking for a good gift for her sister [Mary].
('Dennis', 'Mary')
[Dennis] enjoys talking to his sister. Her name is [Jennifer]. [Jennifer] is looking for a good gift for her sister [Mary].
[{('Dennis', 'sister', 'Mary'): [('Dennis', 'sister', 'Jennifer'), ('Jennifer', 'sister', 'Mary')]}]
['sister', 'sister']