Ключевые слова: accounting, adding, alert, blackboard, board, calculate, chalk, change, chart, commerce, concept, coronavirus, counting, dangerous, data, depression, disease, document, education, egg, election, end, epidemic, figures, finance, finish, flu, global, greeting, handwriting, infection, isolated, mathematical, medical, message, no people, number, paint, pandemic, protective, quarantine, remember, stop, striped, tally, vaccine, virus, waiting, writing,