private static void Del_old_pages_not_in_cur(
int i, Int_obj_ref tmp_id, Ordered_hash old_regy, Ordered_hash cur_regy, List_adp del_list) {
if (i == 0) return; // skip logic for first ctg (which doesn't have a predecessor)
int old_len = old_regy.Count();
for (int j = 0; j < old_len; j++) { // if cur is not in new, del it
Int_obj_ref old_id = (Int_obj_ref) old_regy.Get_at(j);
if (!cur_regy.Has(tmp_id.Val_(old_id.Val()))) // old_itm does not exist in cur_regy
del_list.Add(
old_id); // remove; EX: (A,B) in old; B only in cur; old should now be (A) only
}
int del_len = del_list.Count();
for (int j = 0; j < del_len; j++) {
Int_obj_ref old_itm = (Int_obj_ref) del_list.Get_at(j);
old_regy.Del(tmp_id.Val_(old_itm.Val()));
}
}
