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Abacus Games Foster Concentration and Socioemotional Skills in Early Childhood: Permainan Abacus Membantu Mengembangkan Konsentrasi Dan Keterampilan Sosial-Emosional Pada Anak Usia Dini. acopen 2025, 10 (1), 10.21070/acopen.10.2025.12305. https://doi.org/10.21070/acopen.10.2025.12305.