. _:vb50934814 "1"^^ . "A directed line segment is a line segment that is contained by an ordered pair \nof endpoints (a start point and an endpoint)."@en . . _:vb50934815 "1"^^ . . _:vb50934814 . _:vb50934815 . _:vb50934814 . . "SIO_000521" . _:vb50934814 ":arcc045b257" . _:vb50934815 . _:vb50934815 . "directed line segment"@en . _:vb50934815 . _:vb50934815 . _:vb50934814 . _:vb50934814 . _:vb50934814 . _:vb50934815 ":arcc045b258" .