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2, 20-25, 20-30, 20's, 20s, 25-30, 30-35, 30-40, 30's, 30s, 35-40, adult, associate, brown hair, business, business clothing, business man, business woman, businesspeople, cheerful, collaborating, colleague, color, colour, communicating, computer, connecting, connexion, daylight, daytime, delighted, discussion, displaying, e-book, e-reader, electronic book, electronic reader, enjoyment, examining, executive, exhibiting, eyeing, fellow, female, gal, gentleman, glad, gratifying, guy, hall, hallway, happy, human, human being, indoor, inside, joining, jolly, joy, lady, lighthearted, looking, male, merry, negative space, observing, operating, paper, passageway, person, pleasing, pleasure, reader, satisfaction, seeing, smile, speaking, spectating, spectator, suit, tablet, tablet computer, talking, team, thirties, thirty, toiling, twenties, twenty, two, waist-up, western european, white space, wireless, women, work, workplace, world wide web,