要算出兩條件同時存在情況
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學海無涯_不恥下問
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努力學習中,謝謝前輩
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努力學習中,謝謝前輩
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學海無涯_不恥下問
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努力學習中,謝謝前輩
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學海無涯_不恥下問
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努力學習中,謝謝前輩
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努力學習中,謝謝前輩
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學海無涯_不恥下問
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努力學習中,謝謝前輩
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