docs: public List<Pair<Subspace, ModifiableDBIDs>> determineClusters() {
      List<Pair<Subspace, ModifiableDBIDs>> clusters = new ArrayList<>();
  
      for(CLIQUEUnit unit : denseUnits) {
        if(!unit.isAssigned()) {
          ModifiableDBIDs cluster = DBIDUtil.newHashSet();
          CLIQUESubspace model = new CLIQUESubspace(getDimensions());
          clusters.add(new Pair<Subspace, ModifiableDBIDs>(model, cluster));
          dfs(unit, cluster, model);
        }
      }
      return clusters;
    }