ADVANCE FOR SUNDAY, APRIL 30 AND THEREAFTER - In a Tuesday, April 11, 2017 photo, Inez Beltran, right, 3, and Nina Toler-Wells, 2, walk on the trail at Twelve Hills Nature Center in Dallas. Both are enrolled in Seed Preschool, a nature-based program that meets twice a week in an old school bus parked at Twelve Hills Nature Center in Oak Cliff. (Jae S. Lee//The Dallas Morning News via AP)
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