-ene eeee enee ener enne ennu enp- enue enur epee epen eper eppp eprp eren erer erne erpe erre erur euer eur- eure n-up neen neep neer nene nenu nepe nepr nere nerr neru neue neun neur neuu nnnn nnpr nren nrpn nuee nuer nune nunn nupe nure nurn nurp nurr nuru peen peep peer pen- pene penn penu pepe per- pere pern perp perr peru peun peur pneu pnpp pnup ppen pper pppn pppp ppru ppur pre- pree pren prep preu prnp prue pruu pu-e puer pueu pune punu pupe pupu pur- pure purp purr puru reen reep rene renn renu repe repp repr repu rere reru reue reup reuu rppn rrrr rrun ruen ruer rune runn rupe rupp rure rurp ruru ruun u-rp unee unen uner unne upen upne upnp uppe uppp uppu upup ure- urne urre urun urup urur uuen uuuu