Just as a PSA you better get used to this warning: sage: G = FreeGroup(2) sage: x,y = G.gens() sage: H = G / [x**2, y**2] /opt/sage/src/bin/sage-ipython:1: ******************************************************************************** The __hash__ method of Element is broken. Beware of any function that relies on it, as it may return wrong results. This issue is being tracked at http://trac.sagemath.org/sage_trac/ticket/19302. ********************************************************************************
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