Ginting, Elfrida, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia
Ginting, Lisa Melvi, Mechanical Engineering Education, Faculty of Engineering, Universitas Negeri Medan, Medan 20221 (Indonesia)
Gultom, Endang Sulistyarini, Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia

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