queryList.addAll(elementsInSet);
      }
      List<Element> tmp = Lists.newArrayList(elementsInSet);
      Collections.shuffle(tmp, random);
      queryList.addAll(tmp.subList(0, extras));
    }

    // now add bad queries
    while (queryList.size() < numQueries) {
      Element candidate = newElement();
      if (!elementsInSet.contains(candidate)) {
        queryList.add(candidate);
      }
    }