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trends timeline for %E3%82%A8%E3%83%89%E3%83%AF%E3%83%BC%E3%83%89%E3%83%BB%E3%82%B8%E3%83%A7%E3%83%B3%E3%83%BB%E3%83%AC%E3%82%A4%20-%20Ed%20Ray%20(academic)