-struct psi_plist *psi_plist_ins_range(struct psi_plist *list, size_t offset_start, size_t num_eles, void **eles);
+struct psi_plist *psi_plist_ins_r(struct psi_plist *list, size_t offset_start, size_t num_eles, void **eles);
+
+bool psi_plist_unset(struct psi_plist *list, size_t index);