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https://www.google.com/search?newwindow=1&biw=1104&bih=765&tbm=isch&sa=1&q=ダンゴウオ&oq=ダンゴウオ&gs_l=img.12..0i30l10.37935.37935.0.38558.1.1.0.0.0.0.79.79.1.1.0.msedr...0...1c.1.64.img..0.1.77.7deDr6SKWAo