if ( Array.isArray(element)) {
        let isNested = false;

    for(let i = 0; i < element.length; i++){
        // handle nested
        if(Array.isArray(element[i])){

            var newElement = element.reduce(function(prev, curr) {
                return prev.concat(curr);
            });
            result.push(newElement);
           // result.push(element.flat(Infinity));
            isNested = true;
            break;
        }
    }
        // handle not nested
        if(!isNested){
            result.push(element.sort());
        }


    }