where</span> <span class="nv">size</span><span class="ss">(</span><span class="nv">INVALS</span><span class="ss">)</span> <span class="nv">is</span> <span class="nv">even</span>.

<span class="nv">Internally</span>, <span class="nv">this</span> <span class="nv">routine</span> <span class="nv">uses</span> <span class="nv">a</span> <span class="nv">pivoting</span> <span class="nv">strategy</span> <span class="nv">similar</span> <span class="nv">to</span> <span class="nv">the</span>
<span class="nv">method</sp