Two other graph functions work with graphs that are not necessarily 4-valent. The function fKLinGraph (webMathematica fKLinGraph) gives all non-isomorphic KL projections contained in a given graph G. For example, the graph 

contains two KL graphs: the graph 


corresponding to a link 412 (4) and the graph 


corresponding to the Whitehead link 512 (2 1 2) (b). The function fAddDig (webMathematica fAddDig) produces from a given graph G all 4-regular non-isomorphic graphs by replacing single edges by double (bigonal) edges. For example, from the 3-valent graph  


we obtain two non-isomorphic 4-valent graphs