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Effendy, Sjahril, Universitas Muhammadiyah Sumatera Utara, Indonesia (Indonesia)
Effendy, Sjahril, Universitas Medan Area (Indonesia)
Effendy, Sjahril, Universitas Muhammadiyah Sumatera Utara (Indonesia)
Enjelita, Elly, Universitas Medan Area

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