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Subscript[x, y] and the Symbol x

Dear Mathgroup:

The Subscript function in Mathematica has no built-in meaning.  What
definition can I give this function to allow me to use Subscript[x,y] as
a "stand-alone" symbol that is completely distinct from the Symbol x or
the Symbol y?  For example:

\!\(f[x_, y_] := x\_y\  + \ x + y\)



This is exactly what I don't want.  Instead I want
Plus[4,Subscript[x,y]].  Is there a way to do this?

Thanks for your help.
Curt Fischer
Tokyo Institute of Technology
Dept. of Bioengineering

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