olympic postage stamp
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希腊在第一届奥运会上发行了世界上第一套奥林匹克纪念邮票，共12枚。
Greece issued the first set of Olympic commemorative stamps in the 1st Olympic games. There are 12 in a set.
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世界上第一套奥林匹克纪念邮票哪个国家发行，共几枚？
In which country was the Olympic commemorative stamps issued? And how many stamps in a set?
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