In this Nov. 29, 2018 photo, Levi Rahn, left, and Alejandro Acosta, both 4, build a tower during a preschool class at Dimensions Education Programs in Lincoln, Neb. (Gwyneth Roberts/Lincoln Journal Star via AP)
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In this Nov. 29, 2018 photo, Levi Rahn, left, and Alejandro Acosta, both 4, build a tower during a preschool class at Dimensions Education Programs in Lincoln, Neb. (Gwyneth Roberts/Lincoln Journal Star via AP)
