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Teenagers in classroom.
man, male, guy, bloke, boy, lad, person, people, woman, female, lady, girl, teenager, teen, teenaged, teenage, youth, young, adolescent, juvenile, isolated, caucasian, white, background, horizontal, brunette, hair, haired, brown, brunet, student, scholar, college, university, tertiary, education, high, school, further, continuing, higher, undergraduate, postgraduate, sitting, sat, seated, sit, chair, standing, stood, stand, speaking, speak, talk, talking, chat, chatting, discussing, friends, mates, friendship, companion, hold, holding, pen, ballpoint, biro, learn, learning, from, above, looking, down, desk, table, pointing, finger, point, out, at, hand, gesture, gesturing