+#error "do not use rsbetween.h, it all is in rset.h"
+RSET rsbetween_create( NMEM nmem, int key_size,
+ int (*cmp)(const void *p1, const void *p2),
+ RSET rset_l, RSET rset_m, RSET rset_r, RSET rset_attr,
+ char *(*printer)(const void *p1, char *buf) );