code: public int filterObject(CaptureSearchResult o) {
  		String thisUrl = o.getOriginalUrl();
  		String thisDate = o.getCaptureTimestamp();
  		int result = ObjectFilter.FILTER_INCLUDE;
  		if(lastUrl != null) {
  			if(lastUrl.equals(thisUrl) && thisDate.equals(lastDate)) {
  				result = FILTER_EXCLUDE;
  			}
  		}
  		lastUrl = thisUrl;
  		lastDate = thisDate;
  		return result;
  	}
docs: /* (non-Javadoc)
  @see org.archive.wayback.util.ObjectFilter#filterObject(java.lang.Object)