n-up nnnn nnpr non- nonn nono nonu noo- noon nooo noop noor nor- norn noro norr noun noup nour nron nrpn nunn nuno nuon nurn nurp nurr nuru onno onon onor onpu onup onur oooo opo- opon opor oppo orno oro- oron oror orro orup oun- our- ourn ouro ouu- pnon pnpo pnpp pnro pnup pono ponp poon poop poor pop- popo popp porn poro porr poun poup pour pppn pppo pppp ppru ppur prnp pro- pron proo prop prou pruu puno punu pupu pur- puro purp purr puru rono roon roop roor ropo roro roru roun roup rpon rppn rrrr rrun runn runo rupp ruro rurp ruru ruun u-rp unno unon unop unro uor- upnp upon upor uppp uppu upup uro- uroo urpo urun urup urur uuno uuuu