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  1. Effective vs efficient - WordReference Forums

  2. Efficient at or in - WordReference Forums

  3. effective vs efficient | WordReference Forums

  4. efficient vs effective | WordReference Forums

  5. effectively vs efficiently - WordReference Forums

  6. effective on/at/in - WordReference Forums

  7. efficient - effective - efficacious | WordReference Forums

  8. efficient / effective - WordReference Forums

  9. cost-effective, cost-efficient, value-for-money - WordReference …

  10. cost effective vs low cost - WordReference Forums