Comment #1 on issue 2805 by smi...@gmail.com: Should unevaluated objects still sort their args?
http://code.google.com/p/sympy/issues/detail?id=2805
Since this doesn't affect the printing, my hunch is it would be better to sort them. That way, if you didn't create any new factors in a list/set you can reconstruct a canonical Mul again.
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