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Since A & B will have no way to know, and D did not know the answer.公仔箱論壇0 B! Y" P/ D$ ~" w1 O# W3 B  u+ E
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This is a tough question for grade 1.  
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; X# e( \; I1 I/ x  [: Ztvb now,tvbnow,bttvbI most likely cannot answer it within 5 minutes when I was that young.8 g+ W, R0 P$ m) \, X
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Wow, really enjoy this question.  Thank you for sharing.