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5. so well designed, easy to understand, or easy to use that is cannot go wrong or be used wrongly
6. absolutely correct; making no mistakes
10. doing a job, sport, or activity for money, rather than just for fun
11. keen; enthusiastic; intense
13. to give something up completely
14. not in the correct key, out of tune
15. a substance that is burned to provide heat or power
16. to promote or recommend something or someone
17. to stop shaking or moving about

1. the object or aim in doing something
2. a process of travelling from one place to another
3. the range of capabilities that someone or something has; powers or resources not yet developed or made use of
4. the place to which someone or something is going or being sent
7. the state or quality of being stable
8. achieving or resulting in the required outcome
9. the area near something or someone
12. an ideal, principle, aim, etc, that people support and work for
13. to state positively and confidently; to guarantee
18. a test or trial