(4,∞)−{5}(4, \infty)-\{5\}(4,∞)−{5}
(5,∞)−(4,∞)(5, \infty)-(4, \infty)(5,∞)−(4,∞)
[4,∞)−{5}[4, \infty)-\{5\}[4,∞)−{5}
[5,∞)−[4,∞)[5, \infty)-[4, \infty)[5,∞)−[4,∞)