每个问题集中，助教会选出5道题(从分配的问题中随机选择)，但是却会提供所有问题的答案。
The TA will grade 5 problems in each set (from the assigned problems - selected randomly), but answers will be provided for all.
每个问题集中，助教会选出5道题(从分配的问题中随机选择)，但是却会提供所有问题的答案。
The TA will grade 5 problems in each set (from the assigned problems - selected randomly), but answers will be provided for all.
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