public void pop(GSS cu, Node cn, int ci) { if (!cu.equals(start)) { if (!toPop.containsKey(cu)) { toPop.put(cu, new HashSet<Node>()); } toPop.get(cu).add(cn); Item cnt = cu.getItem(); for (Entry<Node, Set<GSS>> e : cu.getEdges().entrySet()) { Node w = e.getKey(); for (GSS u : e.getValue()) { Node x = getNodeP(cnt, w, cn); add(cnt, u, ci, x); } } } }