They can be used in many ways.It's hard to explain them all. 令: 1)It can be used with other character as a noun. Like 军令(military order) 2)It also can be used with other character as a verb. Like 命令(require/command),btw,命令can be noun,in that case it means order. 3)If it is used alone,it's similar with 让,like 'make' in the 'he makes me feel nervous'. 让: 1)as a verb,it means give around,for example,neither of them is willing to give around.(他们各不相让.)It also means let somebody in or let somebody have sth.at a good price. 2)Same meaning with the'令' 孔：It's usually used as a noun,it means hole and a surname.

"令", "让" ， generally describing the result caused by someone/something, same usage. For example, Make somebody confused. 令某人困惑了/ 让某人困惑了 Please note that those character can be combined with other character to make completely different meaning. For example, 命令 order 忍让 to be forbearing / to tolerate 孔 generally means "a hole / opening" when it is used standalone. But we usually will not use it in that way.... For example, 毛孔 skin pores Again, it have completely different meaning when combined with other words.

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