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### Co-authors

- Elly RosmainiUniversitas Sumatera UtaraVerified email at usu.ac.id
- Saleh HajiUniversitas BengkuluVerified email at unib.ac.id
- Andy SaptaUniversitas Terbuka, IndonesiaVerified email at ecampus.ut.ac.id
- sondang purnamasari pakpahanDosen FKIP Universitas TerbukaVerified email at ecampus.ut.ac.id
- syahriani siraitUniversitas AsahanVerified email at una.ac.id
- Siti RusdianaSyiah Kuala UniversityVerified email at unsyiah.ac.id
- Mahyuddin K M NasutionUniversitas Sumatera UtaraVerified email at usu.ac.id
- Elvina HerawatiLecturer of Mathematic. University of Sumatera UtaraVerified email at usu.ac.id
- Prana Ugiana GioUniversitas Sumatera UtaraVerified email at usu.ac.id
- Aang NuryamanLampung UniversityVerified email at fmipa.unila.ac.id
- syarifah Meurah YuniDepartement of mathematics Syiah Kuala UniversityVerified email at unsyiah.ac.id
- M. D. H. GamalAssociate Professor of Applied Mathematics and Optimization, University of Riau, Pekanbaru 28293, IndonesiaVerified email at unri.ac.id
- Rahmawati PaneLecturer of Mathematics Department, University of North SumateraVerified email at mhs.statistika.its.ac.id
- Moch Aruman ImronAssociate Professor of Mathematics, University of BrawijayaVerified email at ub.ac.id