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180 Degrees (CCW/CW)
(x,y) = (-x,-y)
90 Degrees (CCW)
(x,y) = (-y,x)
90 Degrees (CW)
(x,y) = (y, -x)
270 Degrees (CCW)
(x,y) = (y, -x)
270 Degrees (CW)
(x,y) = (-y, x)