x=0 y x=2
x=0, x=-2
y=0, y=2
y=0, y=-2
x=0, y=2
y=2, x=0
y=-3, y=-1
x=-3, x=-1
x=-3, y=-1
y=-3, x=-1
y=-3
y=-1
x=-3
x=-1
x=0
x=2
x=-2
y=0
y=2
y=-2