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{﹣3,﹣2,﹣1,0} {﹣2,﹣1,0} {﹣3,﹣2,﹣1} {﹣2,﹣1}
(﹣5,1] [1,3) [﹣7,3) (﹣5,3)
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(-2,2) (1,2) -1,0,1 -2,-1,0,1,2
(0,4] [0,4) [-1,0) (-1,0]
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(1,+∞) (0,1) (-1,1) (-∞,1)