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Mu’aafi, D.Y., Sudar, S. and Johan, A.N. 2026. The Effectiveness of Using Instagram Social Media to Improve Vocabulary Mastery of Eleventh-Grade Students at SMA Negeri 4 Purworejo in the Academic Year of 2025/2026 . Ranah Research : Journal of Multidisciplinary Research and Development. 8, 3 (May 2026), 1761-1769. DOI:https://doi.org/10.38035/rrj.v8i3.2062.