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В ходе празднования юбилея декана математик Ольга Барковская находит виновницу торжества убитой. Рядом с телом — карточка из неиз...

During the celebration of the dean's anniversary, mathematician Olga Barkovskaya finds the culprit of the celebration murdered. Next to the body is a card from an unknown game, very similar to the one that was thrown to Olga the day before....