this is a problem present since eAthena, bugreport:309 details it. the item hash or "tagging" prevents exploits like
thanks to kenpachi's item_combo_db we can now store all combos away from the items preventing the above scenario from taking place w/o the hash stuff, e.g. looping through the combo db once and checking for matching pairs, however that is quite inefficient (you see, we have about to 200 pairs of combos and 14 equipment slots, the loop would be awful), we need a clever way to fix this bug (preferably away from that awfully huge loop). discuss / post your opinions / scream at me, whatever you like :3