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A: What can I do for you ? B: I want a T-shirt for my father. A: 51 ? This kind of T-shirt sells well. B: It looks nice. I think my father will like it. A: 52 ? B: Size M. A: 53 ? We have white, black, yellow and blue. B: Yellow. 54 ? A: One hundred and twenty yuan. B: OK. I’ll take it. 55 . A: Thank you. 51._________________