public static void main(String[] args) {
		ArrayList<Integer> list = new ArrayList<Integer>();
		for (int i = 0; i < 100000; i++) {
			list.add(i);
		}

		long t0 = System.nanoTime();
		List<Integer> ret = twice(list);
		for(int i : ret) {
			;
		}
		System.out.println((System.nanoTime() - t0));
		
		
		LinkedList<Integer> lList = new LinkedList<Integer>();
		for (int i = 0; i < 100000; i++) {
			lList.add(i);
		}
		t0 = System.nanoTime();
		ret = twice(lList);
		for(int i : ret) {
			;
		}
		System.out.println((System.nanoTime() - t0));
	}