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There's one I can't find much about, but I think I've determined the basis for most of your list. Here it is, regrouped a bit: ほげ - hoge ほげら - hogera ほげほげ - hogehoge ふが - fuga ぴよ - piyo The first three are all variations on hoge. Digging around, this appears to derive from the verb hogeru, "a hole opens up, a hole appears; to fall apart". ...


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