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2, 20-25, 20-30, 20's, 20s, 25-30, 40-45, 40-50, 40's, 40s, 45-50, 50-55, 50-60, 55-60, adult, associate, collaborating, colleague, color, colour, communicating, computer, conferring, connecting, connexion, consultation, contemporary, current, daylight, daytime, defending, discussion, displaying, e-book, e-reader, electronic book, electronic reader, exhibiting, exterior, fellow, female, fifties, fifty, forties, forty, gal, gentleman, glove, guy, hall, hallway, human, human being, joining, lady, low angle, male, medical, mid life, middle age, middle aged, middle-age, middle-aged, negative space, operating, outdoor, outside, passageway, person, r&d, research and development, rubber glove, safeguard, security, speaking, sunlight, sunshine, tablet, tablet computer, talking, team, three-quarter length, together, toiling, twenties, twenty, two, up-to-date, white space, wireless, women, work, world wide web,