attending, attends, back-pack, back-packs, backpack, backpacks, book, books, boy, boys, buddies, buddy, child, childhood, children, class, classes, classroom, classrooms, color, color image, colored, colors, colour, colours, companionship, comrade, comrades, day, daylight, daytime, desk, desks, educate, educated, educates, educating, education, educations, educator, educators, elementary age, elementary school, examining, fifty, friend, friendliness, friendship, friendships, furnishing, furnishings, furniture, girl, girls, group, groups, hand raised, hands raised, horizontal, horizontally, horizontals, human, human being, humans, indoor, indoors, inside, instruct, instructed, instructing, instruction, instructions, instructs, intelligence, juvenile, juveniles, kid, kids, knowledge, knowledgeable, learn, learned, learning, learns, learnt, lower school, man, mature adult, mature men, medium group of people, men, mid life, middle age, middle aged, middle-age, middle-aged, multiracial group, occupation, occupations, pal, pals, person, photographic, photography, primary school, primary schools, pupil, pupils, respond, responding, responds, response, responses, rucksack, rucksacks, school, school boy, school boys, school building, school buildings, school girl, school girls, school supplies, schoolboy, schoolboys, schoolgirl, schoolgirls, schoolroom, schoolrooms, schools, seated, sit, sits, sitting, student, students, studied, studies, study, studying, supplies, taught, teach, teacher, teachers, teaches, teaching, together, togetherness, tome, tomes, training, tuitions, tutor, tutoring, tutors, wisdom, young, youngster, youngsters, europe, germany, western europe