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          Income Tax Regs., provides that “the common parent * * * shall be           
          the sole agent for each subsidiary in the group, duly authorized            
          to act in its own name in all matters relating to the tax                   
          liability for the consolidated return year.”  In S. Pac. Co. v.             
          Commissioner, supra at 401, we held that the regulation                     
          contemplates that the common parent’s authority to act as the               
          agent for an affiliated group arises on a year-by-year basis.               
          For any year for which a consolidated return is filed, the common           
          parent for that year is the exclusive agent with respect to any             
          procedural matters that may arise in connection with the group’s            
          tax liability for that year.  Id.; see also Union Oil Co. v.                
          Commissioner, 101 T.C. 130 (1993).                                          
               Because of the importance of the identity of the common                
          parent, the continuation of the common parent is critical to the            
          continuation of the affiliated group.  The rules for determining            
          when an affiliated group continues to exist are set forth in                
          section 1.1502-75(d), Income Tax Regs.  Section 1.1502-75(d)(1),            
          Income Tax Regs., provides the general rule that a group shall              
          continue if the common parent remains as the common parent and at           
          least one subsidiary remains affiliated with it, whether or not             
          the subsidiary was a member of the group in a prior year, and               
          whether or not one or more corporations have ceased to be                   
          subsidiaries at any time after the group was formed.                        
               Sections 1.1502-75(d)(2) and (3), Income Tax Regs., provide            
          exceptions to the general rule.  Under section 1.1502-                      
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