var subsetsWithDup = function(nums) {
    let res = [];
    nums.sort((a, b) => a - b); // Sort nums to handle duplicates

    function subsets(index, curr) {
        if (index === nums.length) {
            res.push([...curr]); // Make a copy of curr to store in res
            return;
        }
        // Include the current number
        curr.push(nums[index]);
        subsets(index + 1, curr);
        curr.pop();
        // Exclude the current number and skip all duplicates
        while (index < nums.length - 1 && nums[index] === nums[index + 1]) {
            index++;
        }
        subsets(index + 1, curr);
    }

    subsets(0, []);
    return res;
};