public static DepType getDepType(DependencyTree tree, int pIdx, int aIdx) {
   Bunsetsu pBun = tree.getBunsetsuFromNodeId(pIdx);
   Bunsetsu aBun = tree.getBunsetsuFromNodeId(aIdx);
   Bunsetsu pBunHeadBun = tree.getBunsetsuFromId(pBun.getHead());
   Bunsetsu aBunHeadBun = tree.getBunsetsuFromId(aBun.getHead());
   if (pBun.getId() == aBun.getId()) {
     return DepType.SAME_PHRASE;
   } else if (pBun.getId() == aBunHeadBun.getId()) {
     return DepType.DEP;
   } else if (pBunHeadBun.getId() == aBunHeadBun.getId()) {
     return DepType.DEP;
   } else {
     return DepType.ZERO_INTRA;
   }
 }