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Category:Open problems
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Subcategories
This category has the following 9 subcategories, out of 9 total.
- Year of death unknown (1,236 P)
C
H
P
- Philosophical problems (26 P)
- Place of birth unknown (205 P)
U
Y
- Year of birth unknown (5,624 P)
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The following 11 pages are in this category, out of 11 total.