Assume that there is only one duplicate number, find the duplicate one.
假设只有一个数字出现重复，找出这个重复的数字。
This compact has made in duplicate, one for each party.
第十五条本协议一式两份，甲乙双方各执一份。
The agreement is in duplicate, one for each other.
本协议一式两份，双方各执一份。
The agreement is in duplicate, one for each other.
本协议一式两份，双方各执一份。
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