Figure 4From: On the group theoretical background of assigning stepwise mutations onto phylogeniesMatrices illustrate the four Abelian groups for a twenty-state alphabet. (a) the Z 2 × Z 2 × Z 5 group, (b) Z 4 × Z 5 , (c) Z 2 × Z 10 , and (d) Z 20 . Each matrix visualizes the cosets of the subgroups of the depicted group and suggests an associated grouping of the 20 states.Back to article page