>>105
(1, 0) (8/7, -3/7) (8/7, -5/7) (1, -1) (5/7, -8/7) (3/7, -8/7) (0, -1) (-3/7, -5/7) (-5/7, -3/7)
(-1, 0) (-8/7, 3/7) (-8/7, 5/7) (-1, 1) (-5/7, 8/7) (-3/7, 8/7) (0, 1) (3/7, 5/7) (5/7, 3/7) (1, 0)
の18点を通る楕円。