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no caption--(A) diagram for math problems
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催花秘術(簡易幻術之一種), Secrets of forcing flowers (one example of an easy illusion)
胡學愚 Hu Xueyu (Author),
Article
算學遊戲, Mathematic games
馮孟久 Feng Mengjiu (Author),
Image
no caption--(A) diagram for math problems