I'm displaying a bunch of posets and prefer the vertices to be orange as 
opposed to the default blue.  The code below works fine, but I'd like to avoid 
including the option specification by setting the option for vertex colors to 
be 'orange' and I can't find exactly how to do this.     Any help?

example=Poset({0:[2],1:[2],2:[3],3:[]})
example.show(vertex_colors='orange')

Ken Levasseur
UMass Lowell
http://faculty.uml.edu/klevasseur/ads2

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