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          principle for the period in dispute, the later event is the NOL             
          which arose in 1982, and which was carried back to 1979 which               
          displaced more 1979 credits back to 1977.  Section 6601(d)(1)               
          provides specifically:                                                      
               If the amount of any tax * * * is reduced by reason of                 
               a carryback of a net operating loss * * * such                         
               reduction in tax shall not affect the computation of                   
               interest under this section for the period ending with                 
               the filing date for the taxable year in which the net                  
               operating loss * * * arises.                                           
          Thus, applying the statute, the interest computation is not                 
          changed by the 1982 NOL before March 15, 1983.  Before that date,           
          interest is computed on the deficiencies as they existed on                 
          January 1, 1980, reflecting the ITC carried back from 1979, as if           
          the NOL had not occurred.                                                   
               Interest should then properly be charged based on the                  
          deficiency determined sequentially by succeeding events.  That              
          is, as to the 1977 tax year, for the period January 1, 1980, to             
          March 14, 1983, interest is to be computed based on the                     
          deficiency amount of $3,777,997, which reflects the carryback               
          from 1979 of an ITC in the amount of $7,947,605 and an FTC in the           
          amount of $2,307,548.  As to the 1978 tax year, for the period              
          January 1, 1980, to March 14, 1983, interest is to be computed              
          based on the deficiency amount of $2,530,339, which reflects the            
          carryback from 1979 of an ITC in the amount of $444,727.                    
               It should be pointed out that, under this analysis, there is           
          no danger of petitioner's receiving a double benefit for the 1979           
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