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| Russian | English |
| Письмо с информацией о новых проблемах с безопасностью ЛС | Dear Doctor Letter (Katherine Schepilova) |
| письмо с уведомлением о вручении | certified letter (If a letter is sent by certified mail, the person who receives it must sign their name to show that it has been received. cambridge dictionary amatsyuk) |