Fri, 03 Oct 2014 00:31:18 -0500 Pierre-Yves David spanset: use base implementation for __sub__
Fri, 03 Oct 2014 00:30:58 -0500 Pierre-Yves David spanset: use base implementation for __and__
Fri, 03 Oct 2014 00:39:57 -0500 Pierre-Yves David spanset: use base implementation for filter
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