_:b61090753 _:b61090754 . _:b61090754 . _:b61090756 "2018-01-01"^^ . _:b61090754 _:b61090755 . _:b61090754 _:b61090757 . _:b61090757 _:b61090758 . _:b61090755 _:b61090756 . _:b61090758 "2018-12-31"^^ .