Ключевые слова: background, barefoot, blackboard, board, business, by, chalk, chalkboard, challenge, clean, concept, conservation, development, employment, foot, footprint, footstep, future, growth, human, icon, idea, ideas, label, ladder, leadership, life, motivation, moving, new, occupation, opportunity, pattern, people, person, progress, promotion, risk, shape, sign, skill, space, staircase, step, steps, succes, success, symbol, time, up, vein, walk, walking, warming, way, white,