Welcome to prep playoff history class with Professor Kosmo.

In districts, we were treated to a fair share of rematches from the regular season. What’s that? Kosmo got an A+ and a gold star for going 7-0 with his picks ? Well, some of us were blessed with good looks and others are ball-knowers. Put Kosmo in whatever category you will.

But when it comes time for regionals, some of the young whippersnappers may be unfamiliar the last times these teams have crossed paths or the history that these matchups have.

So allow your Professor of Pigskinomics to get a little old school and walk you down memory lane while trying to deliver another plate full of perfect picks from this week’s regionals.

Detroit Catholic Central at Clarkston, 7 p.m. — It doesn’t take too much digging to recall the l

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