digraph repo {
    rankdir = "LR";
    bgcolor = "transparent";
    node[width=0.15, height=0.15, shape=point, color=white, fontcolor=white];
    edge[weight=2, arrowhead=normal, arrowsize=0.6, color=white];
    define(`digraph', `subgraph')
    include(`master.dot')
    include(`merged.dot')
    include(`feature.dot')
    include(`bugfix.dot')
    m7 -> f1;
    m9 -> b1;
}