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Changing the variable order in commutative operators


Hi,

I'm trying to change the order of arguments in the output of commutative 
operators such as
Plus and Times.

For example the input
y+x+z
always gives the output
x+y+z

Is there a way to specify a user defined order on these variables
to get the output
y+x+z
instead ?

Thanks in advance,
Dave Snead 





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