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          effective with respect to decedents dying after March 1, 1994.              
          Sec. 20.2056(b)-10, Estate Tax Regs.  The majority “[leaves] for            
          another day the issue of the validity of that regulation.”                  
          Majority op. p. 16.  What is one to make of that statement?  Can            
          the majority possibly believe that section 2056(b)(7) is                    
          ambiguous and that both the position we take today and the                  
          position we took in the enumerated cases, and that the                      
          Commissioner takes in section 20.2056(b)-7(d)(3), Estate Tax                
          Regs., are reasonable interpretations of the statute?  Only if              
          the statute is ambiguous is the Commissioner then free to write a           
          regulation adopting any reasonable interpretation.  NationsBank             
          v. Variable Annuity Life Ins. Co., 513 U.S. ___, ___, 115 S. Ct.            
          810, 813-814 (1995); Chevron, U.S.A. Inc. v. Natural Resources              
          Defense Council, Inc., 467 U.S. 837, 842-844 (1984).  No court,             
          neither this Court nor any of the Courts of Appeals that have               
          reversed us, has suggested any significant ambiguity in the                 
          statute, much less an ambiguity broad enough to tolerate the                
          diametrically opposed readings found in our prior cases and in              
          the case we decide today.  Certainly, decedents whose estate tax            
          cases might on appeal go to a Court of Appeals different than the           
          three that have reversed us bear the risk that such court might             
          find section 2056(b)(7) ambiguous.  Also certainly, the Supreme             
          Court might find section 2056(b)(7) ambiguous (or unambiguous, as           
          interpreted by section 20.2056(b)-7(d)(3), Estate Tax Regs.).               
          Can we seriously say, however, that there is a substantial risk             
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