The graph shown in figure 1 is a very simple version of what a graph could look like...[1] This graph is formed by taking the last 6 elements of the 7-mer and linking it to the node whose first 6 elements are the same. Figure 1 is the most simplistic a de Bruijn graph can be, since each node has exactly one path into it and one path out. Most of the time, you will most likely see a graph where there is more than one edge directed to a node and/or more than one edge leaving a node.