text: $(function  () {
    var group = $("ol.limited_drop_targets").sortable({
      group: 'limited_drop_targets',
      isValidTarget: function  (item, container) {
        if(item.is(".highlight"))
          return true
        else {
          return item.parent("ol")[0] == container.el[0]
        }
      },
      onDrop: function (item, container, _super) {
        $('#serialize_output').text(group.sortable("serialize").get().join("\n"))
        _super(item, container)
      },
      serialize: function (parent, children, isContainer) {
        return isContainer ? children.join() : parent.text()
      },
      tolerance: 6,
      distance: 10
    })
  })
  