. _:b3983017 . . . _:b3983018 . . "1500" . "precision at century" . _:b3897129 . _:b3983017 . _:b3897128 . _:b3897129 . _:b4171420 "1500"^^ . _:b3983018 "1500"^^ . _:b3983018 . _:b4171421 "1500"^^ . _:b4171420 . _:b3897128 . _:b3897128 "1500"^^ . _:b4171421 . _:b3983017 "1500"^^ . _:b4171421 . _:b4171420 . _:b3897129 "1500"^^ .