abeltolu

function getSubsequences(str){
    let len = str.length, output, counter = 0, result = [];
    for (let i = 1; i < Math.pow(2, len); i++) {
        output = '';
        for (var j = 0; j < len; j++) {
            if (i & (1 << j)) {
                output += str[j];
            }
        }
        counter++;