P = (-4,-3)------------->(-y,x)-----------> P' = (3,-4)
Q = (-1,2)------------->(-y,x)-----------> Q' = (-2,-1)
R = (1,-3)------------->(-y,x)-----------> R' = (3,1)
S = (-3,-4)------------->(-y,x)-----------> S' = (4,-3)
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