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Ratman, as seen in a webcomic called "lab rat"

thumb|293px|right|how to find the rat densRatman

For those who are not familiar with Ratman, he was a scientist at Aperture Science who was smart and knew that GlaDOS would go crazy and said for people to not create her. All throughout Portal 2, you can see his many "rat dens" which show many clues about him.

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