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March Madness perfect bracket odds: Chances of a perfect bracket and deadline to submit

It's time to start making a bracket — or at least thinking about one.

Who will cut down the nets at the Final Four? What lower-seed will become this year's Cinderella team? What teams were under-seeded, or perhaps over-seeded, and have a favorable first-round matchup? Where will the upsets fall during the Road to San Antonio and the Alamodome?

Those questions and then some will be answered in just two hours when the official NCAA Tournament bracket is unveiled at 6 p.m. ET on CBS during the Selection Sunday bracket reveal show.