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3 years old, 3-5 year olds, 4 years old, 4-12 year olds, Head Start, Headstart, Hispanic, Latina, Latino, NYC, USA, age 3, age 4, boy, child, cooperate, cooperation, cooperative, education, ethnic diversity, ethnic mix, female, four years old, funnel, girl, horizontal, joint project, male, pouring, pre-K, pre-kindergarten, preschool, table, three years old, together, water, working together