title: Create Mathematica/Combinatorica graph with edges that have named vertices
body: <p>How do I make a Mathematica graph from edges with named vertices? EG: </p>
  
  <p><a href="http://pastebin.com/Se1Nhe3M" rel="nofollow noreferrer">http://pastebin.com/Se1Nhe3M</a> </p>
  
  <p>I've tried the above and several variations, but Combinatorica never 
  quite accepts it right. Apparently, Graph[] wants coordinate 
  positions, which I want Combinatorica to figure out itself. </p>
  
  <p>AddVertex to EmptyGraph[0] (or whatever) also fails. </p>
  
  <p>GraphUtilities isn't an option, since I want to do fairly complex 
  analysis on my graphs. </p>
  
  <p>This seems like a simple problem. Graphviz easily creates graphs from 
  edges with named vertices, so I'm sure Mathematica can too? </p>
  
  <p>I've read:</p>
  
  <p><a href="https://stackoverflow.com/questions/2941727/showgraph-e1-e2-e1-e3-e1-e2-e3-what-is-the-problem-here">ShowGraph[ { {e1,e2}, {e1, e3} }, {e1,e2,e3} ]; // what is the problem here?</a></p>
  
  <p>but it doesn't seem to help with my specific case.</p>