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having thought about the questions that they raise,
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and you need to come to discussion section
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then prepared to discuss this week's set of issues.
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You need to listen to what your classmates are saying
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and say why you disagree with them.
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And not just that you disagree with them,
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but to raise an objection.
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Or why you agree with them.
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And when somebody else then attacks them,
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say, "Look, I think that what John was saying was a good point
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and here's how I think he should have defended his position,"
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or what have you.