Comment #2 on issue 2855 by [email protected]: Move preordering of 'arg' from Add.flatten to Add._hashable_content.
http://code.google.com/p/sympy/issues/detail?id=2855
Remark to Commetn #1: Only one test raises a question whether it is right or not: "test_evalf_complex_cancellation()" in the "test_solvers.py"
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