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Br Sembiring, Murna Sari, Pendidikan IPA, FMIPA Universitas Negeri Medan (Indonesia)
Br Tarigan, Tesya Lonika, Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Br. Gurusinga,, Dinda Natalisa, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan 20221, Indonesia (Indonesia)
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