Two other graph functions
work with graphs that are not necessarily 4valent. The function fKLinGraph (webMathematica fKLinGraph)
gives all nonisomorphic KL projections contained in a given graph G. For
example, the graph
{{1,2},{1,2},{1,4},{1,4},{1,5},{2,3},{2,3},{2,5},{3,4},{3,4},{3,5},{4,5}} 

contains two KL graphs:
the graph
{{1,2},{1,2},{1,4},{1,4},{2,3},{2,3},{3,4},{3,4}} 

corresponding to a link
4_{1}^{2} (4) and the graph
{{1,2},{1,2},{1,4},{1,5},{2,3},{2,5},{3,4},{3,4},{3,5},{4,5}} 

corresponding to the Whitehead
link 5_{1}^{2} (2 1 2) (b). The function fAddDig (webMathematica fAddDig)
produces from a given graph G all 4regular nonisomorphic graphs by
replacing single edges by double (bigonal) edges. For example, from the
3valent graph
{{1,2},{1,3},{1,6},{2,4},{2,6},{3,4},{3,5},{4,5},{5,6}} 

we obtain two nonisomorphic
4valent graphs
{{1,2},{1,2},{1,3},{1,6},{2,4},{2,6},{3,4},{3,4},{3,5},{4,5},{5,6},{5,6}} 

and
{{1,2},{1,3},{1,3},{1,6},{2,4},{2,4},{2,6},{3,4},{3,5},{4,5},{5,6},{5,6}}. 

