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export default function subsets(nums: number[]): number[][] {    const ans: number[][] = [];
    for (let i = 0; i < 2 ** nums.length; i++) {        const temp: number[] = [];        for (            const [j, v] of (                Array.from(i.toString(2)).reverse().entries()            )        ) {            if (v === "1") {                temp.push(nums[j]);            }        }        ans.push(temp);    }    return ans;}