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| navigate by keyword : abstract answer background baffled baffling concept confused explained explanation illustration issues mysterious mystery not problem questions red secret sign solution solve solved solving unable unanswered unexplained unresolved unsolvable unsolved word |
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| Illustration depicting a sign with an unsolved concept. |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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