Ключевые слова: assistance, background, base, business, career, caucasian, certified, cognition, company, concept, conceptual, content, control, diagram, discovery, economics, education, endanger, finance, grey, guarantee, job, keyboard, legal, liability, marketing, message, old, paper, pen, person, product, professional, protection, quality, recall, refund, responsible, return, risk, safety, seller, signs, skill, sticky, text, training, transfer, word, work,