counting/numbering students skipping the duplicates for attendance report

[Ummi]

Hi All,
I'm trying to count students chronologically but skip the duplicated students. I've tried autofill series but it does not skip duplicates. I also do not want to remove any of the duplicates. I'm numbering/counting 200 + students. I'm trying to find out a faster way to do this. Thanks

 

[Fluff]

Duplicate to: counting students skipping the duplicate

In future, please do not post the same question multiple times. Per Forum Rules (#12), posts of a duplicate nature will be locked or deleted.

In relation to your question here, I have closed this thread so please continue in the linked thread.