A Mystery Known to All
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- Year: 1981
- Country: Soviet Union
- Genre: Music, Family, Comedy
- Studio: Dovzhenko Film Studios
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- Director: Mykola Zasieiev-Rudenko
- Cast: Yulya Zhivotvorova, Yuri Prokhoda, Nadezhda Rumyantseva, Nikolay Grinko, Zinovi Vysokovsky, Valeriy Nosik
