t neighbors of vertex by 2-d (orientation), 3-d (adjacency), or n-d (f.visitid,id) ('i', 'o')</li>
<li><a href="io.c#printafacet">qh_printafacet</a> print facet
in an output format </li>
<li><a href="io.c#printbegin">qh_printbegin</a> print header
for an output format </li>
<li><a href="io.c#printend">qh_printend</a> print trailer for
an output format </li>
<li><a href="user.c#printfacetlist">qh_printfacetlist</a>
print facets in a facetlist</li>
<li><a href="io.c#printfacets">qh_printfacets</a> print
facet