      <button data-index="2">[top, bottom]</button>
                <button data-index="3">[left, bottom]</button>
                <button data-index="4">[top, right]</button>
                <button data-index="5">None</button>
            </div>
        </div>
        <script>
        $(function() {
            var axes = [
                ['top', 'left', 'bottom', 'right'],
                ['left', 'right'],
                ['top', 'bottom'],
                ['left', 'bottom'],
                ['top', 'r