private List<Link> getPureInnerLinks() {
		final List<Link> result = new ArrayList<Link>();
		for (Link link : diagram.getLinks()) {
			final IEntity e1 = (IEntity) link.getEntity1();
			final IEntity e2 = (IEntity) link.getEntity2();
			if (e1.getParentContainer() == group && e1.isGroup() == false && e2.getParentContainer() == group
					&& e2.isGroup() == false) {
				result.add(link);
			}
		}
		return result;
	}