prion rpion piron ipron ripon irpon proin rpoin porin oprin ropin orpin piorn iporn poirn opirn ioprn oiprn riopn iropn roipn oripn iorpn oirpn prino rpino pirno iprno ripno irpno prnio rpnio pnrio nprio rnpio nrpio pinro ipnro pniro npiro inpro nipro rinpo irnpo rnipo nripo inrpo nirpo proni rponi porni oprni ropni orpni prnoi rpnoi pnroi nproi rnpoi nrpoi ponri opnri pnori npori onpri nopri ronpi ornpi rnopi nropi onrpi norpi pionr iponr poinr opinr iopnr oipnr pinor ipnor pnior npior inpor nipor ponir opnir pnoir npoir onpir nopir ionpr oinpr inopr niopr onipr noipr rionp ironp roinp orinp iornp oirnp rinop irnop rniop nriop inrop nirop ronip ornip rnoip nroip onrip norip ionrp oinrp inorp niorp onirp noirp
Note: these 'words' (valid or invalid) are all the permutations of the word prion. These words are obtained by scrambling the letters in prion.