Ключевые слова: background, black, blackboard, board, business, buy, buyer, chalk, chalkboard, check, checkbox, choice, choose, choosing, chose, communication, concept, concepts, conceptual, customer, decision, design, drawing, economy, finance, financial, fingers, label, market, money, options, owner, owning, pick, picking, present, promotion, property, purchase, purchasing, sale, select, sell, shop, sign, store, symbol, technology, text, white, world, writing,