public static boolean checkStatementExceptions(List<? extends Statement> lst) {

    Set<Statement> all = new HashSet<>(lst);

    Set<Statement> handlers = new HashSet<>();
    Set<Statement> intersection = null;

    for (Statement stat : lst) {
      Set<Statement> setNew = stat.getNeighboursSet(EdgeType.EXCEPTION, EdgeDirection.FORWARD);

      if (intersection == null) {
        intersection = setNew;
      }
      else {
        HashSet<Statement> interclone = new HashSet<>(intersection);
        interclone.removeAll(setNew);

        intersection.retainAll(setNew);

        setNew.removeAll(intersection);

        handlers.addAll(interclone);
        handlers.addAll(setNew);
      }
    }

    for (Statement stat : handlers) {
      if (!all.contains(stat) || !all.containsAll(stat.getNeighbours(EdgeType.EXCEPTION, EdgeDirection.BACKWARD))) {
        return false;
      }
    }

    // check for other handlers (excluding head)
    for (int i = 1; i < lst.size(); i++) {
      Statement stat = lst.get(i);
      if (!stat.getPredecessorEdges(EdgeType.EXCEPTION).isEmpty() && !handlers.contains(stat)) {
        return false;
      }
    }

    return true;
  }
public static boolean checkStatementExceptions(List<? extends Statement> lst)