public static int random_deletes(CommunityDAO dao, int howmany) {
		
		KeyRegistrationRecord [] recs = dao.getRegisteredKeys();
		Collections.shuffle(Arrays.asList(recs));
		int removed = 0;
		for( int i=0; i<howmany && i<recs.length; i++ ) { 
			try {
				dao.deregisterKey(recs[i].getBase64PublicKey());
				removed++;
			}catch( Exception e ) {
				e.printStackTrace();
			}
		}
		return removed;
	}