I have no idea how this works
Take a look at the patterns of the posts and you'll catch on!
But here's an explanation too. The count started with A and is eventually supposed to end with ZZZ,ZZZ. The first round of counting simply went through the alphabet in single letters, so A, B, C, D, etc. The second round went AA, AB, AC, AD, AE, and so on. Once AZ was reached, the next round was BA, BB, BC, BD, BE. Once BZ was reached, it was CA, CB, CD, CE, and so forth. On the previous page to this one, VZ was reached. So we should actually be starting with W's at WA. Once ZZ is eventually reached, then it will go to triple digits beginning with CAA, CAB, CAC, CAD, etc. Once CAZ is reached, then it would be CBA, CBB, CBC, CBD, etc.
Currently we're still on double digits and starting with W's. So next is:
WA