function only_evens(lst){
    var even_lists = [];

    console.log("LISTS", lst);

    for ( var i = 0; i < lst.length; i++ ){
        var thisList = lst[i];
        var thisListIsAllEven = true;
        console.log("THIS LIST", lst[i]);

        for ( var j = 0; j < thisList.length; j++ ){

            console.log("LIST ELEMENT", j, thisList[j]);
            if (thisList[j] % 2 != 0){
                thisListIsAllEven = false;
                break;
            }
        }

        if (thisListIsAllEven){
            even_lists.push(thisList);
        }
    }

    return even_lists;
}

var answer = only_evens([[1, 2, 4], [4, 0, 6], [22, 4, 3], [2]]);
console.log("ANSWER", answer);