所有的用户ID和条目id是从0开始的连续整数。
All user id's and item id's are consecutive integers, both starting at zero.
两个连续整数之和是29。
第二个结果以类regex的方式更特定地描述了一个整数值看上去象什么:一个或多个数字的连续序列。
The second production describes in regex-like fashion more specifically what an integer literal looks like: a contiguous sequence of one or more numeric digits.
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