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Related Clues:
- Took for a trial run
- Challenged, or what the theme entries in this puzzle should be
- Took out for a spin
- Stuck a toe in
- Worked on in the lab
- Made an attempt
- Pushed to the limit
- Attempted, endeavoured
- Attempted, tried
- Attempted, strove
- Subjected to examination or trial
- Probed or analysed
- Tried or examined
- Examined, tried
- Subjected to examination, put through paces