Comment #6 on issue 935 by fab...@fseoane.net: .match() behaves in a random  
manner.
http://code.google.com/p/sympy/issues/detail?id=935

> However, the pattern matching implementation should not depend on it.

+1 on that

to achieve consistency maybe we should not only match the expression (many  
matches
are possible), but also return the "best possible match" (i wouldn't accept  
second
behaviour of #0 as correct)

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