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||Pages in this category should be moved to subcategories where applicable.
This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, articles and should mainly contain subcategories.
Use one of the following categories:
fictional or artificial mysteries
- category:Open problems
- category:Out-of-place artifacts
- category:Unexplained disappearances
- category:Undeciphered writing systems
problems with known solutions