We're going to have other ways of building them, but it could be a collection of all the primes. Hm.

但是我们很快就要学习到，实际上这些集合是可以是任意的。

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Second step, hm. That also looks constant, you think? Oh but wait a minute. I'm accessing s.

第二步，恩，看起来也像常量,你认为呢？等等，我在进入这个数组。

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