supplementary lesson . Haridussõnastik. Estonian Language Institute, Sõnaveeb 2026. https://127.0.0.1:5577/search/unif//har/supplementary%20lesson/1/eng (08.10.2026)
supplementary lesson . Haridussõnastik. Estonian Language Institute, Sõnaveeb 2026. https://127.0.0.1:5577/search/unif//har/supplementary%20lesson/1/eng (08.10.2026)