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大家可以動動腦，
算一下下面簡單的數學題喔...
沒有陷阱別想得太複雜，但也不能太粗心！
There is a bus with 7 girls inside,
Each girl has 7 bags,
Inside each bag, there are 7 big cats,
Each big cat has 7 small cats,
All cats have 4 Legs each!
Question: How many Legs are there inside the bus?
答案晚點公布囉....
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