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To see all available qualifiers, see our documentation.
[http://code.google.com/p/sympy/wiki/GSoC2007 GSoC2007]
[http://code.google.com/p/sympy/wiki/GSoC2008 GSoC2008]
[http://code.google.com/p/sympy/wiki/GSoC2009 GSoC2009]
[http://code.google.com/p/sympy/wiki/GSoC2010 GSoC2010]