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you can choose Pile A or Pile B
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and tell me how many lines to remove.
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Any advice from the audience?
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you're on your own here.
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Can you remove three from Pile A?
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Professor Ben Polak: Three from Pile A, so three from Pile A.
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Evan your turn. Stand nearer to the board.
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Can you remove two from Pile A.
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Professor Ben Polak: Two from Pile A--okay
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so Pile A is the popular pile here.
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Two from Pile B.
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Professor Ben Polak: Two from Pile B, suspense is building here.