Test Mode
Reading Mode
Right = 0
Wrong = 0
(x, y) = (a, b)
(x, y) = (-a, b)
(x, y)=(-a, -b)
(x, y) = (a, -b)
(p - q), (p + q)
(q - p), (p + q)
(p + q), (p - q)
(p + q), (q - p)