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Takes one to know one
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so the biologist must himself be a cat.
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Well, that's clearly false.
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You don't have to be feline to study the feline.
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Takes one to know one;
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so, you can't be a Canadian and study Mexicans,
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because it takes one to know one.
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Well, that's just clearly stupid.
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Of course the Canadians can study the Mexicans
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and the Germans can study the French.
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It does not take one to know one;
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to understand the truths about the French,