How do I duplicate item when using jquery sortable?

$("#sortable1").sortable({
    connectWith: ".connectedSortable",
    forcePlaceholderSize: false,
    helper: function (e, li) {
        copyHelper = li.clone().insertAfter(li);
        return li.clone();
    },
    stop: function () {
        copyHelper && copyHelper.remove();
    }
});
$(".connectedSortable").sortable({
    receive: function (e, ui) {
        copyHelper = null;
    }
});

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