] &amp; edges[1]</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t60" href="#t60">60</a></span><span class="t"><span class="str">                corner c2 => right + bottom => edges[1] &amp; edges[2]</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t61" href="#t61">61</a></span><span class="t"><span class="str">                corner c3 => bottom + left => edges[2] &amp; edges[3]</span>&nbsp;</span><span class="r"></span></p>
 