These three edges, three overlaps here at the top, and

two are in blue and one is in green.

And now this is an overlap graph so the notes correspond to reeds and

the edges correspond to overlaps between the reeds and

each edge is labeled with the length of the overlap.

So if you look at these three edges, and

stop to think about what they mean, you'll realize that the presence of

those two blue edges implies the presence of the green edge.

In other words, if you just told me that those two blue edges were there,

I could figure out that the green edge was also there.

The blue edges are saying that there's an overlap of six between these two reads,

and an overlap of six between these two reeds.

And all the reads are of length seven.

And when you put those facts together,

you realize that there must be an overlap of length five between these two reads.

So the green edges, in some sense, implied by the two blue edges.