将下列句子重新排序，组成一段完整的对话。

A. No. May I see that one, please?

B. How much is this postcard?

C. Yes, I want to buy some postcards.

D. Can I help you? 

E. Sure.

F. It's two yuan. 

G. I'll take five, please.

H. Do you like this one?

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