is it possible to display a poset with (LaTeX) labels on the covering 
relations and (LaTeX) labels on the vertices?

For example:

sage: P = Poset([[1,2,3,4], [[1,2], [2,3], [1,4]]])
sage: e = {i: "$q^%s$" % i for i in P}
sage: c = {(i,j): "$%s^%s$" % (i, j) for i, j in P.cover_relations()}
sage: P.plot(element_labels=e, cover_labels=c)

This almost works.  Unfortunately, the layout is not the dot2tex layout, 
which I need because my posets are large, and it displays 'None' instead of 
the edge label.

Martin

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