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efek
effect.
efektif
effective.
mengefektifan: cause something to be effective.
keefektifan: effectiveness.
pengefektifan: effort to make something effective.
efisien
efficient.
mengefisienkan: render effiecient, maximize the use of something.
keefisienan: efficiency.
pengefisienan: effort to make something efficient.
efisiensi
efficiency.
pengefisiensian: effort to make something efficient.