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"Ok, why's that?"
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"I've never seen her in my life."
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"Ok, that makes sense."
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"Yeahhhh but she looks just like me and we have the same eyes."
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"There is only one answer, get her DNA and compare it to yours."
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"Yeah, that's true."
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"DNA reveals everything, it will work."
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"I'll do that then."
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"Good, if she really is your sister, she won't mind if you take a small sample of her."