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2, 20-25, 20-30, 20's, 20s, 25-30, adult, apparel, clothes, clothing, color, colour, commerce, communicating, computer, connecting, connexion, daylight, daytime, defending, discussion, e-book, e-mailing, e-reader, electronic book, electronic device, email, examining, eyeing, farming, fellow, full body, full-length, garment, gentleman, guy, human, human being, husbandry, industrialization, joining, looking, low angle, luminous-vest, male, negative space, observing, operating, outdoor, outside, person, power, reader, safeguard, safety vest, safety-vest, security, seeing, sky, speaking, storing, tablet computer, talking, trade, twenties, twenty, two, western european, white space, wireless, work, world wide web,