clusters

Layers and Clusters

 Hi,
I need to create graphs with clusters that are not perfectly hierarchical.  For example, nodes a and b are in one cluster and nodes b and c are in another cluster.  I had hoped that putting the clusters into different layers might solve the problem, but it does not.  Any given node appears only in a single cluster.  The following dot input demonstrates the problem:
digraph G { layers="1:2"; node [layer=all]; edge [layer=all];
a0 -> b0; a0 -> b1;

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