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IRENE ROJAS/MissourianEmma Kingsley, 4, left, and director Holly Kroon watch as Garrett Hoover, 4, traces a sandpaper letter before carving it in coffee grounds at the Columbia Montessori School on JuIRENE ROJAS/MissourianBraden McKenzie, 4, left, waits his turn while Ben Stephen, 5, works on a multiplication board at the Columbia Montessori School on July 9.