Ключевые слова: 3d, auction, b2b, b2c, b2e, business, buy, c2c, chalk, chalkboard, client, commerce, communication, concept, consumer, consumption, customer, desk, end, goods, handwritten, intermediary, internet, market, network, office, office supplies, presentation, public, purchase, rendering, sale, sell, services, site, small chalkboard, stationery, table, top view, trade, transaction, user,