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組合數學實際上是一個很好的思維練習,如果你有一段時間沒有做數學的話,這個話題更容易理解
Combinatorics is actually a good exercise for your mind, easier topic to home in on if you haven't done math for a while - styLIShT
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梳子是最好的
COMB. IS THE BEST
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