This is a real puzzle, in the sense that I'm puzzled by what I've found.
I stumbled upon a google sheet in my google drive.
The first column contains the (Swedish) alphabet, one letter on each row. The second and third columns are manually entered numbers. The fourth column is the difference between the second and third column. The fifth and sixth column contains a few manually entered numbers.
This info was input on friday the 28th of August 2015 at 9 pm.
What could I possibly have been doing? Does anyone see a sensible pattern here?