upgrade(troops,"sarranid_recruit","sarranid_footman")
upgrade2(troops,"sarranid_footman","sarranid_veteran_footman","sarranid_skirmisher")
upgrade2(troops,"sarranid_veteran_footman","sarranid_horseman","sarranid_infantry")
upgrade(troops,"sarranid_infantry","sarranid_guard")
upgrade(troops,"sarranid_skirmisher","sarranid_archer")
upgrade(troops,"sarranid_archer","sarranid_master_archer")
upgrade(troops,"sarranid_horseman","sarranid_mamluke")
Just replace sarranid with Arab with the exception of mamluke, just leave it like that.