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they must be separate things.
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Now, of course,
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it could still be
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that in the real world the
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one thing cannot exist without the other.
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There may be some sort of metaphysical laws
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that tie the two things so tightly together
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that you'll never actually get one without the other.
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That's not the question.
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The point is just if I can at least imagine
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the one thing without the other,
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they must in fact be two separate things.