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| Changes of ash and sulphur content in coal mine production cycle | 215 |
| November 2012 | December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | |
| Changes of ash and sulphur content in coal mine production cycle | 14 | 11 | 17 | 7 | 14 | 13 | 12 |
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