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any questions about anything
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that I've asked or said so far, up to this point?
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Let me make a remark about questions,
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which is--today's mostly business.
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Hopefully, it'll be fairly straightforward.
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But both today and throughout the entire semester,
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as I'm lecturing
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I want to invite you to jump in with questions.
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Well, jump in is a bit of an exaggeration.
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I don't want you to just start talking, but raise your hand.
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If I'm saying something that you don't understand,
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the chances are pretty good that