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     Compiler error C2584
 
     'identifier1' : direct base 'identifier2' is inaccessible; already
     a base of 'identifier3'
 
     The specified derived class (<identifier1>) was derived from a
     direct base class <('identifier3')> that was already a base class
     of the derived class (<identifier2>).
 
     A class (or structure) cannot use the same class more than once as
     a direct base class (a class mentioned in the list of base classes
     for the derived class). A base class can be used more than once
     as an indirect base class (a class not in the list of base
     classes).
                                    -♦-