Anna, Antonina, Alena and Alla are the main characters of the series and at the same time best friends. In honor of this friendship, the name of the club "Format A-4", the owner of which was Anna, appeared. However, the A-4 format is also one of the most common paper formats used daily by thousands of people around the world. Students and brilliant writers, ordinary clerks and great scientists – the fate of paper also changes depending on who takes it into his hands. The incompetent turns her worthless
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