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mayo
9/18
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mayo
衛生紙是悲傷單位
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mayo
濕的衛生紙是乘法
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mayo
皺的衛生紙是減法
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mayo
乘法加成悲傷
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mayo
減法精簡難過
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mayo
而我
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mayo
是精通四則運算的人
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mayo
單位即為答案