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Sinaga, Cinthia Uly Hotnami, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Sinurat, Dian I, Universitas Negeri Medan (Indonesia)
Sipayung, Murdoni, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sirait, Gloria, Department of Biology Education, Faculty of Teaching and Education, Universitas HKBP Nommensen
Pematangsiantar, Pematangsiantar, Indonesia (Indonesia)
Sirait, Ribka, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan
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