Comment #2 on issue 1908 by fabian.seoane: mutable core
http://code.google.com/p/sympy/issues/detail?id=1908
You are very brave by opening this issue :-)
BTW, ginac uses lists in trees (which is similar to dicts, but not the
same):
http://www.ginac.de/tutorial/Internal-representation-of-products-and-sums.html
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