Fix an adjacency (i,j) in the MBG. On the left is the MBG with three permutations represented by thin lines, double lines and thick lines respectively. On the right is the MBG with (i,j) fixed for all the permutations.
Zhang et al. BMC Genomics 2012 13(Suppl 1):S7 doi:10.1186/1471-2164-13-S1-S7