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- Secret - mysterious
- Secret - restricted to initiates
- Very mysterious
- Mysterious - an acre (anag)
- Intelligible only to the initiated
- It¿s obscure when rearranging what to see before old police force
- Like election laws, typically
- Mysterious, understood by few
- Secret coteries broken up
- I set core cryptic!
- Not widely understood
- Something quite clear can easily become mysterious
- Mysterious, obscure
- Understood only by a few
- Mysterious or understood by few