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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://the-catcher-in-the-fx.com/2017-02-unnyouseisek/201702%E3%82%B7%E3%83%AD%E3%82%AF%E3%83%9E%E3%83%9D%E3%83%B3%E3%83%89/>