code: public Set<String> rangeByRank(final long start, final long end) {
          return doWithJedis(new JedisCallable<Set<String>>() {
              @Override
              public Set<String> call(Jedis jedis) {
                  return jedis.zrange(getKey(), start, end);
              }
          });
      }
docs: Returns the specified range of elements in the sorted set.
  The elements are considered to be ordered from the lowest to the highest score.
  Lexicographical order is used for elements with equal score.
  Both start and stop are zero-based inclusive indexes. They can also be negative numbers indicating offsets from
  the end of the sorted set, with -1 being the last element of the sorted set.
  @param start
  @param end
  @return the range of elements