static void Main(string[] args)
{
LinkedList <int> linkedList = new LinkedList <int> {
key = 11
};
LinkedList <int> linkedList1 = new LinkedList <int> {
key = 12
};
LinkedList <int> linkedList2 = new LinkedList <int> {
key = 13
};
LinkedList <int> linkedList3 = new LinkedList <int> {
key = 14
};
linkedList.LIST_INSERT(linkedList1, linkedList);
linkedList.LIST_INSERT(linkedList2, linkedList1);
linkedList.LIST_INSERT(linkedList3, linkedList2);
}