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16-11-2021 Sergej Yushkevitch:
Stasys Zilevicius did not compose this problem. He was the redactor of the problem-section in "Saskiu Kaleidoskopas". Follow his initiative S.Zilevicius published this problem under two names: under my name and the name of Stanislav Zilis (Latvia). I have sent to this problem (composed separately from S.Zilis) and S.Zilevicius decided to publish it under two names because S.Zilis published the same idea in more simple arrangement earlier.