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![xkcd: Indirect Detection](https://cdn-ak-scissors.b.st-hatena.com/image/square/b301590972f4435dde1959615f6fef04094de322/height=288;version=1;width=512/https%3A%2F%2Fimgs.xkcd.com%2Fcomics%2Findirect_detection_2x.png)