Help me find the flaw in this joke ~

1, holidays and two days a week may overlap.

2. The time of not working coincides with the time of having coffee and lunch.

In addition, if it is a leap year, there will be another day.

4. "52 weeks a year, you have two days off every week, and the remaining 26 1 day goes to work" should be more than 52 weeks a day.

5. "You are absent from work every day 16 hours, and if you subtract 170 days, there is 9 1 day left".

6. The results will vary from year to year. Because the day mentioned in article 4 is not necessarily a day of the week).

A lot, give some points ~