_:b61509793 _:b61509794 . _:b61509790 _:b61509793 . _:b61509794 "2002-01-01"^^ . _:b61509790 _:b61509791 . _:b61509791 _:b61509792 . _:b61509790 . _:b61509792 "2020-01-01"^^ .