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| Category:Conceptual 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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18:43:08, 16 October 2012 + |
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| Subcategory of | Concepts + |
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| Category:Classification systems + , Category:Notation + | Subcategory of |
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