that is, the user's unique identifier
1high pressure cleaning pipespeople2scholarship selection and so on.people3language advancement: implement skip from zero table 2 0 2 4 1 2 0 1 1 6 : 2 4 : 2 7 crawler attack and defense: oncepeople4articlepeople5the textbook i selected was the classic black book "top to bottom", and the order of explanation in this article is different from the original book.peopleto use it, it is probably to identify the exercises in the picture and then convert them into a platform-compatible format.
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