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| AC | This user is an alumnus of Allegheny College |
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| en | This user is a native speaker of the English language. |
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 | This user is a chemist. |
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| PIT | This user is a fan of the Pittsburgh Pirates |
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| PIT | This user is a fan of the Pittsburgh Steelers. |
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| PIT | This user is a fan of the Pittsburgh Penguins |