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Werry Darta Taifur, Fery Andrianus, Syafruddin Karimi, Melinda Noer,, Graduate Program, Universitas Andalas, Kampus UNAND Limau Manis, Padang, West Sumatra 25163, Indonesia Faculty of Economics, Universitas Andalas, Kampus UNAND Limau Manis Padang, West Sumatra 25163 Indonesia Faculty of Agriculture, Universitas Andalas,
Widiasyih, Anugrah Sri, Universitas Graha Nusantara, Padang Sidempuan, North Sumatera, Indonesia