p->rlink->llink=p->rlink; p->llink->rlink=p->llink; delete p;
p->llink->rlink=p->rlink; p->rlink->llink = p->llink; delete p;
p->rlink->llink = p->llink; p->rlink->llink ->rlink = p->rlink; delete p;
p->llink->rlink = p->rlink; p->llink->rlink->llink = p->llink; delete p;