Comment #51 on issue 1358 by [email protected]:  
(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

The original issue seems fixed. There remain problems such as:
In [4]: ((e*f)**2)
Out[4]:
  2  2
e ⋅f

but it has nothing to with subs. Can this be closed?

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