struct casegrouper *casegrouper_create_splits (struct casereader *,
const struct dictionary *);
struct casegrouper *casegrouper_create_subcase (struct casereader *,
struct casegrouper *casegrouper_create_splits (struct casereader *,
const struct dictionary *);
struct casegrouper *casegrouper_create_subcase (struct casereader *,