I can't see anything here but the title.... But I know that you get the paths of length 4 by taking the adjacency matrix to the 4th power.
This is also easy to guess as the first and the last path are b->a and a->b
I can't see anything here but the title.... But I know that you get the paths of length 4 by taking the adjacency matrix to the 4th power.
This is also easy to guess as the first and the last path are b->a and a->b