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| Category:Opera organizations |
| 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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17:55:05, 9 January 2016 + |
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| Subcategory of | Opera + , Arts organizations + , Music organizations + , Vocal and choral music organizations + |
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| Category:Opera companies + | Subcategory of |
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