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kolmel korral, viisil toimuv või esinev
трёхкратный . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%82%D1%80%D1%91%D1%85%D0%BA%D1%80%D0%B0%D1%82%D0%BD%D1%8B%D0%B9/1/rus (17.08.2026)