public static void getCandidate(ArrayList<Integer> candidate, int current) {
		for (Integer in : oneLeap.get(current))
			candidate.add(in);
		for (Integer ou : oneLeap.get(current)) {
			for (Integer in : oneLeap.get(ou))
				if (!candidate.contains(in) && in != current)
					candidate.add(in);
		}
	}