2, 20-25, 20-30, 20's, 20s, 25-30, 30-35, 30-40, 30's, 30s, 35-40, accessory, adult, advancement, apparatus, apparel, assembly, associate, builder, building, challenging, chatting, clothes, clothing, collaborating, colleague, color, colour, communicating, communication, conference, conversation, conversing, cooperation, curious, daylight, daytime, defending, demanding, dialog, dialogue, discussing, displaying, earth, examining, excavation, exhibiting, exterior, eyeing, fellow, full body, full-length, garment, gathering, gentleman, gesturing, ground, group, guy, hard hat, hat, helmet, human, human being, interest, looking, low angle, luminous-vest, machine, making, male, motioning, negative space, outdoor, outside, person, producing, reader, roadway, safeguard, safety vest, safety-hat, safety-vest, security, seeing, seriousness, soil, solemn, somber, speaking, stepping, stone, street, striding, talker, team, thirties, thirty, toiling, transit, transport, transporting, twenties, twenty, two, western european, white space, work, worker,