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+3b I've said the product was is 2 plus 3 b.
我们已经说了答案是。
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So we said B was somewhere between 0 and 1/4, let's draw the case for B equals 1/4.
我们之前也说过B在0到1/4之间,这里我们绘制B=1/4的情况吧
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