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Related Clues:
- Demonstration of strength of spirit
- First impression
- Demonstration of impenetrability?
- Evidence of spiritual strength
- Puzzle for the scary one to write up
- 13 two girls, one required by the Grauniad?
- Matter to be solved
- Matter hard to cope with
- Measure of the strength of alcohol
- Positive evidence
- Difficulty to be solved
- Puzzle — difficulty
- Verification
- Difficulty (these days, of any kind)
- Render impervious (to)