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effective
,
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skuteczny, efektywny
producing a successful result
It wasn't the most effective way to solve this problem.
It's a highly effective method.
What an easy and effective strategy!
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successful
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efficient
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sprawny, skuteczny, efektywny, racjonalny (np. metoda)
I think this method of production is efficient.
I expect the efficient use of resources, both financial and human.
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productive
He got a rise because he is a very productive worker.
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efficacious