code: public static LongStream zipfian(int items, double constant, int events) {
      return generate(new ZipfianGenerator(items, constant), events);
    }
docs: Returns a sequence of events where some items are more popular than others, according to a
  zipfian distribution.
  
  @param items the number of items in the distribution
  @param constant the skew factor for the distribution
  @param events the number of events in the distribution