prison rpison pirson iprson ripson irpson prsion rpsion psrion sprion rspion srpion pisron ipsron psiron spiron ispron sipron rispon irspon rsipon sripon isrpon sirpon priosn rpiosn pirosn iprosn riposn irposn proisn rpoisn porisn oprisn ropisn orpisn piorsn iporsn poirsn opirsn ioprsn oiprsn riopsn iropsn roipsn oripsn iorpsn oirpsn prsoin rpsoin psroin sproin rspoin srpoin prosin rposin porsin oprsin ropsin orpsin psorin sporin posrin opsrin soprin osprin rsopin sropin rospin orspin sorpin osrpin pisorn ipsorn psiorn spiorn isporn siporn piosrn iposrn poisrn opisrn iopsrn oipsrn psoirn spoirn posirn opsirn sopirn ospirn isoprn sioprn iosprn oisprn soiprn osiprn risopn irsopn rsiopn sriopn isropn siropn riospn irospn roispn orispn iorspn oirspn rsoipn sroipn rosipn orsipn soripn osripn isorpn siorpn iosrpn oisrpn soirpn osirpn prisno rpisno pirsno iprsno ripsno irpsno prsino rpsino psrino sprino rspino srpino pisrno ipsrno psirno spirno isprno siprno rispno irspno rsipno sripno isrpno sirpno prinso rpinso pirnso iprnso ripnso irpnso prniso rpniso pnriso npriso rnpiso nrpiso pinrso ipnrso pnirso npirso inprso niprso rinpso irnpso rnipso nripso inrpso nirpso prsnio rpsnio psrnio sprnio rspnio srpnio prnsio rpnsio pnrsio nprsio rnpsio nrpsio psnrio spnrio pnsrio npsrio snprio nsprio rsnpio srnpio rnspio nrspio snrpio nsrpio pisnro ipsnro psinro spinro ispnro sipnro pinsro ipnsro pnisro npisro inpsro nipsro psniro spniro pnsiro npsiro snpiro nspiro isnpro sinpro inspro nispro snipro nsipro risnpo irsnpo rsinpo srinpo isrnpo sirnpo rinspo irnspo rnispo nrispo inrspo nirspo rsnipo srnipo rnsipo nrsipo snripo nsripo isnrpo sinrpo insrpo nisrpo snirpo nsirpo prions rpions pirons iprons ripons irpons proins rpoins porins oprins ropins orpins piorns iporns poirns opirns ioprns oiprns riopns iropns roipns oripns iorpns oirpns prinos rpinos pirnos iprnos ripnos irpnos prnios rpnios pnrios nprios rnpios nrpios pinros ipnros pniros npiros inpros nipros rinpos irnpos rnipos nripos inrpos nirpos pronis rponis pornis oprnis ropnis orpnis prnois rpnois pnrois nprois rnpois nrpois ponris opnris pnoris nporis onpris nopris ronpis ornpis rnopis nropis onrpis norpis pionrs iponrs poinrs opinrs iopnrs oipnrs pinors ipnors pniors npiors inpors nipors ponirs opnirs pnoirs npoirs onpirs nopirs ionprs oinprs inoprs nioprs oniprs noiprs rionps ironps roinps orinps iornps oirnps rinops irnops rniops nriops inrops nirops ronips ornips rnoips nroips onrips norips ionrps oinrps inorps niorps onirps noirps prsoni rpsoni psroni sproni rsponi srponi prosni rposni porsni oprsni ropsni orpsni psorni sporni posrni opsrni soprni osprni rsopni sropni rospni orspni sorpni osrpni prsnoi rpsnoi psrnoi sprnoi rspnoi srpnoi prnsoi rpnsoi pnrsoi nprsoi rnpsoi nrpsoi psnroi spnroi pnsroi npsroi snproi nsproi rsnpoi srnpoi rnspoi nrspoi snrpoi nsrpoi pronsi rponsi pornsi oprnsi ropnsi orpnsi prnosi rpnosi pnrosi nprosi rnposi nrposi ponrsi opnrsi pnorsi nporsi onprsi noprsi ronpsi ornpsi rnopsi nropsi onrpsi norpsi psonri sponri posnri opsnri sopnri ospnri psnori spnori pnsori npsori snpori nspori ponsri opnsri pnosri nposri onpsri nopsri sonpri osnpri snopri nsopri onspri nospri rsonpi sronpi rosnpi orsnpi sornpi osrnpi rsnopi srnopi rnsopi nrsopi snropi nsropi ronspi ornspi rnospi nrospi onrspi norspi sonrpi osnrpi snorpi nsorpi onsrpi nosrpi pisonr ipsonr psionr spionr isponr siponr piosnr iposnr poisnr opisnr iopsnr oipsnr psoinr spoinr posinr opsinr sopinr ospinr isopnr siopnr iospnr oispnr soipnr osipnr pisnor ipsnor psinor spinor ispnor sipnor pinsor ipnsor pnisor npisor inpsor nipsor psnior spnior pnsior npsior snpior nspior isnpor sinpor inspor nispor snipor nsipor pionsr iponsr poinsr opinsr iopnsr oipnsr pinosr ipnosr pniosr npiosr inposr niposr ponisr opnisr pnoisr npoisr onpisr nopisr ionpsr oinpsr inopsr niopsr onipsr noipsr psonir sponir posnir opsnir sopnir ospnir psnoir spnoir pnsoir npsoir snpoir nspoir ponsir opnsir pnosir nposir onpsir nopsir sonpir osnpir snopir nsopir onspir nospir isonpr sionpr iosnpr oisnpr soinpr osinpr isnopr sinopr insopr nisopr sniopr nsiopr ionspr oinspr inospr niospr onispr noispr sonipr osnipr snoipr nsoipr onsipr nosipr risonp irsonp rsionp srionp isronp sironp riosnp irosnp roisnp orisnp iorsnp oirsnp rsoinp sroinp rosinp orsinp sorinp osrinp isornp siornp iosrnp oisrnp soirnp osirnp risnop irsnop rsinop srinop isrnop sirnop rinsop irnsop rnisop nrisop inrsop nirsop rsniop srniop rnsiop nrsiop snriop nsriop isnrop sinrop insrop nisrop snirop nsirop rionsp ironsp roinsp orinsp iornsp oirnsp rinosp irnosp rniosp nriosp inrosp nirosp ronisp ornisp rnoisp nroisp onrisp norisp ionrsp oinrsp inorsp niorsp onirsp noirsp rsonip sronip rosnip orsnip sornip osrnip rsnoip srnoip rnsoip nrsoip snroip nsroip ronsip ornsip rnosip nrosip onrsip norsip sonrip osnrip snorip nsorip onsrip nosrip isonrp sionrp iosnrp oisnrp soinrp osinrp isnorp sinorp insorp nisorp sniorp nsiorp ionsrp oinsrp inosrp niosrp onisrp noisrp sonirp osnirp snoirp nsoirp onsirp nosirp
Note: these 'words' (valid or invalid) are all the permutations of the word prison. These words are obtained by scrambling the letters in prison.