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Specification either
data specification
   data types 
      Either('a, 'b) = Left(. .getL : 'a)
                     | Right(. .getR : 'b) with .isRight
                     ;
   
   variables 
       either : Either('a, 'b);
       a : 'a;
       b : 'b;
       getL : 'a;
       getR : 'b;
   
   
end data specification