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| Category:Nature |
| Modification date "Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
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02:24:31, 16 December 2010 + |
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| Subcategory of | Main topic classifications + , Fundamental categories + |
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| Category:Events + , Category:Natural sciences + , Category:Systems + | Subcategory of |
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