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raske, keerukas mõttetöö, kõva nuputamine
головоломка . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D0%B3%D0%BE%D0%BB%D0%BE%D0%B2%D0%BE%D0%BB%D0%BE%D0%BC%D0%BA%D0%B0/1/rus (07.10.2026)