public GSS create(Item item, GSS cu, Node cn, int ci) {
Node w = cn;
GSS v = makeGSS(item, ci);
if (v.addEdge(w, cu)) {
if (toPop.containsKey(v)) {
for (Node z : toPop.get(v)) {
Node x = getNodeP(item, w, z);
add(item, cu, z.getRightExtent(), x);
}
}
}
return v;
}
