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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
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
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;
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
x=top->data;top=top->link; top=top->link;x=top->data; x=top;top=top->link; x=top->data;
top->link=s; s->link=top->link; top->link=s; s->link=top; top=s; s->link=top; top=top->link;
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;