Without knowing for sure, I think OOTP uses generic splits, and there's a case to be made that 90% of the time those are more predictive anyway, and they can't be exploited like small sample size splits can.
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“Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies." -- C.S. Lewis
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