Silitonga, P., Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Kampus Baru UI, Depok, 16424, Indonesia; Dewi, B.E., Department of Microbiology, Faculty of Medicine, Universitas Indonesia, Jl. Salemba Raya No.5, Jakarta Pusat, Jakarta, 10430, Indonesia; Bustamam, A., Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Kampus Baru UI, Depok, 16424, Indonesia; Al-Ash, H.S., Department of Computer Science, Faculty of Computer Science, Universitas Indonesia, Kampus Baru UI, Depok, 16424, Indonesia