for (let i = 0; i < Math.pow(2, res.length); ++i) {
        let binary = i.toString(2);
        while (binary.length < res.length) {
            binary = '0' + binary;
        }

    arrangement: for (let i = 0; i < Math.pow(2, res.length); ++i) {

        let skip = false;

            if (binary[j] == '1') {

            if ((i & (1 << j)) != 0) {

                    skip = true;
                    break;

                    continue arrangement;

        if (skip) continue;

        //console.log(i.toString(2));