private void addPrefixItems(LinkedHashSet<? super LookupElement> model) {
    ContainerUtil.addAll(model, sortByRelevance(groupItemsBySorter(getPrefixItems(true))));
    ContainerUtil.addAll(model, sortByRelevance(groupItemsBySorter(getPrefixItems(false))));
  }
private void addPrefixItems(LinkedHashSet<? super LookupElement> model)