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Use subcategories where applicable, e.g. Category:Unsolved crimes, Category:Unexplained disappearances. For open disputes, use Category:Controversies.
Subcategories
This category has the following 20 subcategories, out of 20 total.
- Lists of unsolved problems (16 P)
B
C
D
E
- Economic puzzles (17 P)
H
I
L
P
S
- Year of song unknown (820 P)
U
W
Pages in category "Open problems"
The following 24 pages are in this category, out of 24 total. This list may not reflect recent changes.