addEdge(graph, parentNode, idNode, 0);
addEdge(graph, idNode, newPartitionNode, 0);
for(IndexedEdge e: outgoing) {
addEdge(graph, newPartitionNode, e.target, e.index);
}
Group parentGroup = grouper.nodeGroup(parentNode);
if(parentGroup==null) {
forNewGroups.add(idNode);
} else {
parentGroup.nodes.add(idNode);
}