# 直观数组

接下来我们介绍的一个技巧叫做**数组**（Subset）。数组在使用上分两种模式，**显性数组**（Naked Subset）和**隐性数组**（Hidden Subset）。从底层上讲，它们是同一个东西，但是在推理上并不相同，而观察层面来说难度也不一样。所以我把他们分开讲解。


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