code: public T items(final int i) {
      loadArrays();
      return (sampleLists == null ? null : sampleLists.items[i]);
    }
docs: Returns a single item from the samples contained in the sketch. Does not perform bounds
  checking on the input. If this is the first getter call, copies data arrays from the sketch.
  @param i An index into the list of samples
  @return The sample at array position <tt>i</tt>