◎◎◎ clever ⪢⪢
When someone is _____, they can solve a hard puzzle or problem.
http://qindex.info/i.php?x=5604

○○○ enigmatic ⪢⪢
From _____ pyramids that have puzzled scholars for centuries to forgotten cities buried beneath the sands of time.
http://qindex.info/i.php?x=27765

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