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Rear view of little son schoolboy with backpack holding hand of father dad while going to first grade on sunny autumn day, cropped shot of parent and small child on the way to school, standing in park
The three classes of levers systems
Happy clever school children ready for class. Small group of cheerful cute smart kids in casual clothes with books and backpacks standing near row of desks in classroom, raising up hands and smiling
Kids go back to school. Interracial group of children of mixed age run and cheer on the first day of new academic year. Start of school holiday. Preschooler or kindergarten kid. Child in school yard.
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