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Lola Widia Sari Nasution, Sujarwo. Improving Student Learning Outcomes in Theme 2 Always Saving Energy Through Problem Based Learning Models Assisted by Audio Visual Media in Class IV SD IT Darussalam Deli Tua. IJERE [Internet]. 2023 Jul. 31 [cited 2024 Jul. 3];2(2):191-6. Available from: https://ejournal.ipinternasional.com/index.php/ijere/article/view/463