Canonical Labeling of Vertices

We have selected the particular labeling of vertices producing the adjacency matrix, the rows of which, when read from left to right and from top to bottom, give the smallest binary code for this graph if compared with other symmetry-unrelated 

FIGURE 2.19 3-D carbon skeleton of the diamantane C14H20 molecule, which consists of two fused adamantane units with canonical labels. 

FIGURE 2.20 The Desargues-Levi graph, which represents degenerate rearrangeents of CH3-CH2, the first graph constructed by Balaban and coworkers to represent degenerate 

---