f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0
f(x, y) = 0
f(x, y) = 1
f(x, y) = -1
f(x, y) = -0