Graph("E`oo") is the disjoint union of 2 triangles. Graph("ExSW") is two
triangles with 2 more edges connecting them. So the first graph is a
subgraph (a non-induced subgraph) of the second graph. But Sage reports
that it is not. Both graphs have order 6.
sage: h=Graph("E`oo")
sage: g=Graph("ExSW")
sage: h.is_subgraph(g,induced=False)
False
This behavior is in "Sage Version 6.5, Release Date: 2015-02-17".
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