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Help in defining nearly orderless function


Hi there, 

On the up and up in mathematica I got stuck 
with trying to define a function 

f[a,b,c,d]

that satisfies the symmetries:

f[a,b,c,d] = f[b,a,c,d]

and

f[a,b,c,d] = f[a,b,d,c]

Can anyone help?

Note:  These are the only symmetries
I want it to satisfy, Orderless is 
too much freedom.

Thanks
Vlad.

--

                             ___________________________ 
    Vlad.Fridkin at anu.edu.au  || ||| || ||| || ||| || ||| 
       http://wwwmaths.anu.edu.au/~vxf661/Vlad_Fridkin.html


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