124     assert( jarc1->check( ) != 0 );  in check_s()
125     assert( jarc2->check( ) != 0 );  in check_s()
126     assert( jarc1->next->check( ) != 0 );  in check_s()
127     assert( jarc2->next->check( ) != 0 );  in check_s()
128     assert( jarc1 != jarc2 );  in check_s()
182     assert( jarc1->check( ) != 0);  in join_s()
183     assert( jarc2->check( ) != 0);  in join_s()
184     assert( jarc1 != jarc2 );  in join_s()
201 	assert( t1 < t2 );  in join_s()
214     assert( jarc1->check( ) != 0 );  in join_s()
215     assert( jarc2->check( ) != 0 );  in join_s()
216     assert( jarc1->next->check( ) != 0);  in join_s()
217     assert( jarc2->next->check( ) != 0);  in join_s()
223     assert( jarc1->check( ) != 0 );  in check_t()
224     assert( jarc2->check( ) != 0 );  in check_t()
225     assert( jarc1->next->check( ) != 0 );  in check_t()
226     assert( jarc2->next->check( ) != 0 );  in check_t()
227     assert( jarc1 != jarc2 );  in check_t()
254     assert( jarc1->check( ) != 0 );  in join_t()
255     assert( jarc2->check( ) != 0 );  in join_t()
256     assert( jarc1->next->check( ) != 0 );  in join_t()
257     assert( jarc2->next->check( ) != 0 );  in join_t()
258     assert( jarc1 != jarc2 );  in join_t()
275 	assert( s1 > s2 );  in join_t()
288     assert( jarc1->check( ) != 0 );  in join_t()
289     assert( jarc2->check( ) != 0 );  in join_t()
290     assert( jarc1->next->check( ) != 0 );  in join_t()
291     assert( jarc2->next->check( ) != 0 );  in join_t()