p->next=s;s->prior=p;p->next->prior=s;s-next=p->next
p->next->prior=s;p->next=s;s->prior=p;s->next=p->next
s->prior=p;s->next=p->next;p->next=s;p->next->prior=s
s->prior=p;s->next=p->next;p->next->prior=s;p->next=s
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