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(-2,-4) (-3,-6) (-4,-8) (-5,-10)
(﹣2,﹣1) (﹣2,1) (﹣1,0) (﹣1,2)
(-5,-10 ) (-4,-8 ) . (-3,-6) (-2,-4)
(-1,2) (-3,6) (3,-6) (-3,6)或(3,-6)
(﹣2,﹣1) (﹣1,2) (﹣1,0) (﹣2,1)
(﹣2,﹣1) (﹣1,2) (﹣1,0) (﹣2,1)
(-2,-4) (-3,-6) (-4,-8) (-5,-10)
(-1,2) (-3,6) (3,-6) (-3,6)或(3,-6)
(﹣2,﹣1) (﹣1,2) (﹣1,0) (﹣2,1)