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rangkuti, Septi Lumongga Duma
Rani, Zulmai, Department of Pharmacy, Universitas Muslim Nusantara Al Washliyah (Indonesia)
Rashidah, Amalia Amira, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan
Ratnawati, Syarifah, Madrasah Tsanawiyah Negeri 3 Aceh Barat, Aceh Barat, Indonesia
Refelita, Fitri, Jurusan Pendidikan Kimia Fakultas Tarbiyah dan Keguruan Universitas Islam Negeri Sultan Syarif Kasim 28293 Kota Pekanbaru
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