private void removePrepositionalMod(List<DEPNode> l_subNodes, DEPNode node) {
   DEPNode pp = node.getFirstDependentByLabel(DEPLibEn.DEP_PREP);
   if (pp != null) l_subNodes.removeAll(pp.getSubNodeList());
 }
 private void removeRelativeClause(List<DEPNode> l_subNodes, DEPNode node) {
   DEPNode relcl = node.getFirstDependentByLabel(DEPLibEn.DEP_RELCL);
   if (relcl != null) l_subNodes.removeAll(relcl.getSubNodeList());
 }