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1-2 . 22 (IV).

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2 = ͗ 2 1,3-
 

 
- 2 = = 2 1,3-    
- 2 = ї = 2 | 3 2--1,3-  
2 = = 2 | Cl 2--1,3-  
- 2 = ͗ = 2 1,3-  

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