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Sangkot Abdullah Efendi Harahap 2026. The The Excellent Performance Of Madrasah Principals In Developing The Competitive Advantage Of State Madrasah Aliyah In The Riau Islands. International Journal of Education, Vocational and Social Science . 5, 03 (Jul. 2026), 5814-5830. DOI:https://doi.org/10.63922/ijevss.v5i03.3275.