import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Solution {
    public List<List<Integer>> subsetsWithDup(int[] nums) {
        Arrays.sort(nums);
        List<List<Integer>> result = new ArrayList<>();
        result.add(new ArrayList<>());
        for (int i = 0; i < nums.length; i++) {
            List<List<Integer>> tmp = new ArrayList<>();
            for (List<Integer> res : result) {
                List<Integer> list = new ArrayList<>(res);
                list.add(nums[i]);
                if(!result.contains(list)) {
                    tmp.add(list);
                }
            }
            result.addAll(tmp);
        }
        return result;
    }
}