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top→link=s; s→link=top→link;top→link=s; s→link=top;top=s; s→link=top;top=top→link;
s↑.link:=p↑.link;p↑.link:=s q↑.link:=s;s↑.link:=p p↑.link:=s↑.link;s↑.link:=p p↑.link:=s;s↑.link:=q
struct link*next; link next; link*next; struct link next;
s↑.link=p↑.link;p↑.link:=s q↑.link:=s;s↑link=p p↑.link:=s↑.link;s↑.link:=p P↑.link:=s;s↑.link:=q
top->link=s; s->link=top->link;top->link=s; s->link=top;top=s; s->link=top;top=top->link;
p->link=p->link->link p=p->link;p->link=p->link->link p->link=p->link p=p->link->link
top->link=s; s->link=top->link; top->link=s; s->link=top; top=s; s->link=top; top=top->link;
s ->link=p->link;p->link=s q->link=s;s->link=p p->link=s->link;s->link=p p->link=s;s->link=q
current->link=null first->link=current first=current current->link=first
x=top→data;top=top→link; x=top→data; x=top;top=top→link; top=top→link;X=top→data;
x=top→data;top=top→link; x=top→data; x=top;top=top→link; top=top→link;X=top→data;