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I wrote my thesis, wrote it, and went shopping for Shinjuku to buy a bookstand. After that, I wrote again. So I wrote my thesis almost all day. While I wrote it, I wonder how I use prior researches. Though I have different point of view for the object, when I need to show basic information of it, and there are much information in the prior researches, how is it treated? Even though history is something that is composed of texts that someone have narrated, I wonder how should I do.