- - rock turned up before rodents
- - it's both cleaner and smoother
- - With a polishing stone (books then and now feet)
- - A volcanic rock abrasive
- - A light form of lava often used as an abrasive
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- - that visually disadvantaged trio?
- - Nursery trio
- - Trio of rhyme
- - "Three Blind ......" (nursery rhyme)
- - Sightless trio
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