Comment #15 on issue 666 by smi...@gmail.com: sorting of expressions makes subs_dict() fail
http://code.google.com/p/sympy/issues/detail?id=666
In https://github.com/sympy/sympy/pull/690 there is no subs_dict; mattpap's O(x**2) algorithm is used to sort (old,new) pairs in a dictionary; simple count_op length is used to sort other unordered containers of pairs (e.g. pairs given in a set). There is also an exact substitution keyword that then uses rlamy's xreplace.
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