def merge(lists, field):
    new_lst = merge_lists(lists)

    def qs(lst,field):
        if len(lst) <= 1:
            return lst
        else:
            pivot = lst[0]
            smaller = []
            equal = []
            larger = []
            for i in range(0,len(lst)):
                if field(lst[i]) < field(pivot):
                    smaller.append(lst[i])
                if field(lst[i]) > field(pivot):
                    larger.append(lst[i])
                if field(lst[i]) == field(pivot):
                    equal.append(lst[i])
            return qs(smaller,field) + equal + qs(larger,field)

    return qs(new_lst,field)