ator of a set</li>
<li><a href="qset_r.c#setequal">qh_setequal</a> return 1
if two sorted sets are equal </li>
<li><a href="qset_r.c#setequal_except">qh_setequal_except</a>
return 1 if two sorted sets are equal except for
an element </li>
<li><a href="qset_r.c#setequal_skip">qh_setequal_skip</a>
return 1 if two sorted sets are equal except for
a pair of skipped elements </li>
<li><a href="qset_r.c#setequal_skip">qh_setequal_skip</a>
return 1 if two sorted sets are equal except for
a pair of skipped elements