Remove_nodes_with_even_appearance

    public static void deleteEven(SLL<Integer> list1) {
        SLLNode<Integer> d1=list1.getFirst();
        SLLNode<Integer> temp=list1.getFirst();
        int broj=0;
        while(d1 !=null) {
            temp=list1.getFirst();
            broj=0;
            while(temp !=null) {
                if(d1.element==temp.element)
                    broj++;
                temp=temp.succ;
            }
            if (broj%2==0) {
                temp=list1.getFirst();
                while(temp !=null) {
                    if(d1.element==temp.element)
                        list1.delete(temp);
                    temp=temp.succ;

                }
            }d1=d1.succ;
        }
    }