text: coset_init = lib.coset_init_ll
  
  insert =  lib.cs_insert_ll
  remove =  lib.cs_remove_ll
  get_s = lib.cs_get_size_ll
  clear = lib.cs_clear_ll
  get_min = lib.cs_min_ll
  get_max = lib.cs_min_ll
  upper_bound = lib.cs_upper_bound_ll
  rupper_bound = lib.cs_rupper_bound_ll
  get_k = lib.cs_get_k_ll