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Why are we not considering '2006 Aug' data?

Screen Link:
https://app.dataquest.io/m/137/data-cleaning-walkthrough%3A-combining-the-data/9/condensing-the-graduation-data-set

The instructions ask to filter only 2006 data.
While the data for both 2006 and 2006 Aug point to the same DBN and total cohort values but the other entries vary.

So, should the data be considered or not?

Also, assuming that both are nearly same, why are we choosing 2006 over Aug 2006?

This!

I would also like to know why this is and if there is a place where we can find what actually the 2006 August means and why we don’t take it into account!