ll Q14 d Qbb
</pre>
<p>
<li><b>Topological errors</b> -- Merging facets and vertices may lead to topological errors that do
not occur for mathematical, convex hulls.  Qhull merges redundant or degenerate facets.
With option '<a href="qh-optq.htm#Q14">Q14</a>', Qhull tries to correct "dupridges" by merging vertices or facets (see previous issue).
It corrects some instances of dupridges.  Qhull reports a "Qhull topology error" if
a topological error leads to a wide facet or if Qhull fails to create a cone of 