Figure 3
From: Minimum Vertex-type Sequence Indexing for Clusters on Square Lattice

The two configurations for cluster of 7 atoms corresponding to the minimum vertex-type sequence (1,5,8,2,10,5,9) (a), and (1,5,8,6,1,5,9) (b), respectively.
From: Minimum Vertex-type Sequence Indexing for Clusters on Square Lattice

The two configurations for cluster of 7 atoms corresponding to the minimum vertex-type sequence (1,5,8,2,10,5,9) (a), and (1,5,8,6,1,5,9) (b), respectively.