XVIII. 10

:
  (I - XX):    

958, zip, 31

XVIII. 10

10




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                                                                                                                ------------+
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. 1. 7 , , - , - , , , - .

.
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4. 11, 12 18 , . 12 , , .
2. 14 , .

----------------------------------------+----------------------------------------------------------------------------------------------------------+------------
         ____________________                                                                                                                  4
                                                                                                                ------------+
__________ N ________                                                                                                                      
    (                                                                                                                           
                                                                                                                        
           )                                                                                                                                
+----------------------------------------                                                                                                                      
                                                                                                                                                              
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----+-----------------------------------------------------------------------------------------------------------+---------------------------------------------
                                                                                                                                              
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N - - , -- - -- - , দ
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