Reduce a graph to have unique node names
Examples
G <- completegraph(nodes=LETTERS[1:4])
LG <- linegraph(G)
LLG <- linegraph(LG)
R_LLG <- graphreduce(LLG)
Reduce a graph to have unique node names
G <- completegraph(nodes=LETTERS[1:4])
LG <- linegraph(G)
LLG <- linegraph(LG)
R_LLG <- graphreduce(LLG)