d-rod ddddd do-do dodon dodoo dodro dondo donon donor doodo doorn dorno doron dpond drood droon droop drop- dropo n-p-n nnooo no-do no-no no-op nondo nonno nonop noord nordo noron norro onond onoon onorn onpop ooooo oopod opodo oppon ordon ordro ornon orodo orono p-n-p po-on po-po podo- podor pondo ponor poond poopo popon popop poppo porn- porno poro- poron porro prodd proor prop- propn propp propr ro-ro rodon rodor rondo ronno roond rprop