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Substitution for Orderless Functions


   Given the example :

expr = f[a b c] + g[b c d]

   Does anyone know a function to substitute the common elements of 
Orderless functions (like Plus and Time) ? It would be something like this :

SubstituteOrdeless [expr]

   {f[a C[1]] + g[d C[1]], {C[1] -> b c}}

   I'm developing a simple one, so any suggestions are welcome.

      Thanks in advance,

      Roberto Colistete Junior
      (roberto at cce.ufes.br)

      Departamento de Fisica
      Universidade Federal do Espirito Santo
      Brasil
   


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