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运输问题中的位势就是其对偶变量。
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The world is not just divided into good people and Death Eaters. We’ve all got both light and dark inside of us. ___________ matters is the part we choose to act on.
Every year, _______ makes the most beautiful kite will win a prize in the Kite Festival.
Happiness is ________ you think, what you say and what you do are in harmony.
Wisdom and courage are ________ need to make it through cases of emergency.
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