/* empty traverse. */
strset_iterate(&set, in_order_by_2, (unsigned int *)NULL);
/* insert backwards, should be fine. */
for (i = 0; i < NUM; i++)
/* empty traverse. */
strset_iterate(&set, in_order_by_2, (unsigned int *)NULL);
/* insert backwards, should be fine. */
for (i = 0; i < NUM; i++)