C# Solution by using a dummy node


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    public ListNode DeleteDuplicates(ListNode head) {
        ListNode dummy = new ListNode(0), pre = dummy;
        dummy.next = head;
        while(pre.next != null && pre.next.next != null)
            if(pre.next.val == pre.next.next.val)
                pre.next = pre.next.next;
            else pre = pre.next;
        return dummy.next;
    }

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