st circle .n;
    line down 1 at last circle .s;
    line right 1 at last circle .e;
    line left 1 at last circle .w;
    box dashed with .nw at last circle .se + (0.2, -0.2);
    Caption: center of last box;
]</pre>


<p style="margin-top: 1em"><font color="#000000">yields the
block in figure 11-1, which we show both with and without
its attachment points. The block&rsquo;s location becomes
the value of <b>A</b>.</font></p>


<p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/p