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Oppusunggu, Riris, Poltekkes Kemenkes Medan (Indonesia)
Oroh, Nouke Sysca, Universitas Klabat (Indonesia)
Osnia, Osnia, Universitas Islam Sumatera Utara, Department of Chemistry Education (Indonesia)
Othoman, Wan Mazlini, UPSI, Malaysia (Malaysia)
Otoo, Paul, Department of English Kwame Nkrumah University of Science and Technology (Ghana)
Ovami, Debbi Chyntia, Universitas Muslim Nusantara Al Washliyah (Indonesia)
Ovami, Debbi Chyntia, UMN (Indonesia)
Ovami, Debbi Chyntia, Universitas Muslim Nusantara Medan (Indonesia)
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