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| Category:Systems |
| 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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00:31:37, 13 June 2013 + |
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| Subcategory of | Nature + , Structure + , Concepts + |
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| Category:Processes + , Category:Social systems + | Subcategory of |
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