$(function(){
    var sets = [], temp = [];
    $('.relation_box > .format > h5').each(function(i) {
        temp.push(this);
        if (i % 4 == 3) {
            sets.push(temp);
            temp = [];
        }
    });
    if (temp.length) sets.push(temp);

    $.each(sets, function() {
        $(this).flatHeights();
    });
});