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()˶ʿѧλƱҵѧȡòƾרҵмʸ3꣬¾רҵ3꣬ҷ֮һ;רƱҵѧȡòƾרҵмʸ5꣬¾רҵ5꣬ҷ֮һ
()дѧͨѧרƱҵѧ10꣬רҵ20꣬ҷ֮һ
ϿԱУƾרҵмʸϵָʦ(ʦ)ʦʦͳʦѧϵоԱͽڲƾγ̵ġ
ͨȫͳһȡõĹҿֱƸξʦְְ(ִ)ҵʸΪʦʸӦ֤Ϊʦʸ֤顣
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