Ключевые слова: 4, 4 december, agenda, appointment, birthday, block, business, calendar, celebrate, celebration, concept, conceptual, cube, date, day, deadline, december, december calendar, education, elearning, event, fourth day december, freelance, holiday, international, job, labor, lifestyle, month, monthly, notice, number, office, organizer, plan, planner, planning, reminder, schedule, season, start, symbol, time, week, white, winter, wooden, work, workplace,