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Results:
効果 / こうか : n adj-no 1）effect 2）effectiveness 3）efficacy 4）result P
効果器 / こうかき : 1）effector
効果音 / こうかおん : n 1）sound effect 2）sound effects
効力 / こうりょく : n 1）effect 2）efficacy 3）validity 4）potency P
効く / きく : v5k vi 1 1）to be effective 2）to show effect 2 3）to do its work 4）to carry out its function well 3 5）to be possible to use P
効率 / こうりつ : n 1）efficiency 2）efficacy 3）performance 4）utility factor P
効き / きき : n 1）effectiveness 2）efficacy 3）efficaciousness
効 / かい / こう : n 1）effect 2）result 3）worth 4）use 5）avail n 6）efficacy 7）benefit 8）efficiency 9）effect 10）success
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