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The software teaching group of a certain department of the company is organizing daily check-in learning activities for new employees. They have carried out this learning activity for a month, so they want to count the excellent check-in employees this month.
Each employee will correspond to an id, and the daily clock-in record records the ID collection of the clock-in employees on that day, a total of 30 days.
Please implement the code to help count the number of clock-in tp5 employees. add