I am not sure precisely what you are asking. Hopefully, one of the
following points will help clarify my problem (sorry!)"

1. I would never use any single variable twice in a single
combination. There would never be a Var5+Var5+Var+1.

2. The order of the variables in a combination is irrelevent. For my
purposes the string Var1+Var2+Var3 is equal to both Var3+Var2+Var1 and
Var2+Var3+Var1. If, however, for programming purposes the duplicates
could not be removed, I could probably make do with them.

I hope that makes it a bit clearer.