I know someone who works closely with the computer side (mainly the webcast) of the VCU and Philly regional. Apparently it was the program that caused this (the guy I know said the person who wrote it has already been talked to). If you noticed, teams would play once, than 10 (+/- 1) matches later they'd play again. We noticed that every time we were right after team 21. So, basically the problem is the code did not do a completely random job, because they were trying to keep the matches evenly spaced out. There should be no problems at nationals (hopefully
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