sentences:  In 1989, the field expanded to 48 teams.The teams were seeded, and assigned to four geographic regions, with seeds 1-12 in each region.In Round 1, seeds 8 and 9 faced each other for the opportunity to face the 1 seed in the second round, seeds 7 and 10 played for the opportunity to face the 2 seed, seeds 5 and 12 played for the opportunity to face the 4 seed, and seeds 6 and 11 played for the opportunity to face the 3 seed.