OK, how do you write this "g(x)==covertifCan(x, ROMAN)"?   
   (Other than the method I mentioned:)   
      
   -----   
   g(x)==   
       y:=x::String   
       for j in y repeat   
             j in [I,V,X,L]=>1   
             return false   
       true   
      
   I thought the first g()... yes   
   if it possible one conversion   
   from whatever type   
   or sub expression to String   
      
   g(x)==   
       y:=x::String   
       for j in y repeat   
             j in [I,V,X,L]=>1   
             return x   
       x::ROMAN   
      
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