Comment #13 on issue 1358 by wflynny: (e*f*e*f).subs(e*f,f*e+h) fails if  
e*f is not commutative
http://code.google.com/p/sympy/issues/detail?id=1358

Well for one, how can I run an executable that will run all tests for me? I
understand where the tests are located/which tests I failed, but how did  
you generate
the above output? Additionally, what is the difference between a lowercase  
f and an
uppercase F?

Secondly, like the original code, I wrote the patch for one case  
(non-commutative
instead of commutative), so it might be a little while before I can think  
of the best
way to deal with commutative symbols in lists.

I'll try to get a bunch of this done this afternoon.

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