public void deRelateUsers(int uid1, int uid2){
		try {
			rStat.acquire();
			HashMap<Integer, String> rels = userRelations[memberIdxs.get(uid1)];
			if(rels.containsKey(uid2)){
				rels.remove(uid2);
			}
			userRelations[memberIdxs.get(uid1)] = rels;

			rels = userRelations[memberIdxs.get(uid2)];
			if(rels.containsKey(uid1)){
				rels.remove(uid1);
			}
			userRelations[memberIdxs.get(uid2)] = rels;
			rStat.release();
		} catch (Exception e) {
			System.out.println("Error in Rels");
			e.printStackTrace(System.out);
			System.exit(-1);
		}	
	}