Set<Page> temp = new HashSet<Page>(){{
            add(root);
        }};


        Integer position = 0;
        addToMap(position, result, temp);

        while(temp.size() > 0) {
            Set<Page> childrenPages = temp;
            temp = new HashSet<>();
            for(Page page: childrenPages) {
                temp.addAll(page.getChildren());
                addToMap(position, result, childrenPages);
            }
            position++;
        }