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完全具有终端 {0,1,2} 和完全非终端 {S,T,R} 的所有上下文无关文法的集合是可数的还是不可数的?是无限的吗?
正如 Zack 在上面的评论中回答的那样,它是所有图灵机的集合,因此它只能是可数无限的。