YOU SAID:

How could you be so naive?

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とても素朴なことができるか

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So simple you can

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ことができますので、単純です

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It is simple so that you can

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できるように、それは簡単です。

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So, it is easy.

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だから、簡単です。

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It is so easy.

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とても簡単です。

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At its most simple,

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とても簡単です。

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At its most simple,