pepsin eppsin ppesin ppesin eppsin pepsin pespin epspin psepin spepin esppin seppin ppsein ppsein pspein sppein pspein sppein epspin pespin esppin seppin psepin spepin pepisn eppisn ppeisn ppeisn eppisn pepisn peipsn epipsn piepsn ipepsn eippsn ieppsn ppiesn ppiesn pipesn ippesn pipesn ippesn epipsn peipsn eippsn ieppsn piepsn ipepsn pesipn epsipn pseipn speipn espipn sepipn peispn epispn piespn ipespn eipspn iepspn psiepn spiepn pisepn ipsepn sipepn ispepn esippn seippn eisppn iesppn sieppn iseppn ppsien ppsien pspien sppien pspien sppien ppisen ppisen pipsen ippsen pipsen ippsen psipen spipen pispen ipspen sippen isppen psipen spipen pispen ipspen sippen isppen epsipn pesipn espipn sepipn pseipn speipn epispn peispn eipspn iepspn piespn ipespn esippn seippn eisppn iesppn sieppn iseppn psiepn spiepn pisepn ipsepn sipepn ispepn pepsni eppsni ppesni ppesni eppsni pepsni pespni epspni psepni spepni esppni seppni ppseni ppseni pspeni sppeni pspeni sppeni epspni pespni esppni seppni psepni spepni pepnsi eppnsi ppensi ppensi eppnsi pepnsi penpsi epnpsi pnepsi npepsi enppsi neppsi ppnesi ppnesi pnpesi nppesi pnpesi nppesi epnpsi penpsi enppsi neppsi pnepsi npepsi pesnpi epsnpi psenpi spenpi espnpi sepnpi penspi epnspi pnespi npespi enpspi nepspi psnepi spnepi pnsepi npsepi snpepi nspepi esnppi senppi ensppi nesppi sneppi nseppi ppsnei ppsnei pspnei sppnei pspnei sppnei ppnsei ppnsei pnpsei nppsei pnpsei nppsei psnpei spnpei pnspei npspei snppei nsppei psnpei spnpei pnspei npspei snppei nsppei epsnpi pesnpi espnpi sepnpi psenpi spenpi epnspi penspi enpspi nepspi pnespi npespi esnppi senppi ensppi nesppi sneppi nseppi psnepi spnepi pnsepi npsepi snpepi nspepi pepins eppins ppeins ppeins eppins pepins peipns epipns piepns ipepns eippns ieppns ppiens ppiens pipens ippens pipens ippens epipns peipns eippns ieppns piepns ipepns pepnis eppnis ppenis ppenis eppnis pepnis penpis epnpis pnepis npepis enppis neppis ppneis ppneis pnpeis nppeis pnpeis nppeis epnpis penpis enppis neppis pnepis npepis peinps epinps pienps ipenps eipnps iepnps penips epnips pneips npeips enpips nepips pineps ipneps pnieps npieps inpeps nipeps einpps ienpps enipps neipps inepps niepps ppines ppines pipnes ippnes pipnes ippnes ppnies ppnies pnpies nppies pnpies nppies pinpes ipnpes pnipes npipes inppes nippes pinpes ipnpes pnipes npipes inppes nippes epinps peinps eipnps iepnps pienps ipenps epnips penips enpips nepips pneips npeips einpps ienpps enipps neipps inepps niepps pineps ipneps pnieps npieps inpeps nipeps pesinp epsinp pseinp speinp espinp sepinp peisnp episnp piesnp ipesnp eipsnp iepsnp psienp spienp pisenp ipsenp sipenp ispenp esipnp seipnp eispnp iespnp siepnp isepnp pesnip epsnip psenip spenip espnip sepnip pensip epnsip pnesip npesip enpsip nepsip psneip spneip pnseip npseip snpeip nspeip esnpip senpip enspip nespip snepip nsepip peinsp epinsp piensp ipensp eipnsp iepnsp penisp epnisp pneisp npeisp enpisp nepisp pinesp ipnesp pniesp npiesp inpesp nipesp einpsp ienpsp enipsp neipsp inepsp niepsp psinep spinep pisnep ipsnep sipnep ispnep psniep spniep pnsiep npsiep snpiep nspiep pinsep ipnsep pnisep npisep inpsep nipsep sinpep isnpep snipep nsipep inspep nispep esinpp seinpp eisnpp iesnpp sienpp isenpp esnipp senipp ensipp nesipp sneipp nseipp einspp ienspp enispp neispp inespp niespp sinepp isnepp sniepp nsiepp insepp nisepp ppsine ppsine pspine sppine pspine sppine ppisne ppisne pipsne ippsne pipsne ippsne psipne spipne pispne ipspne sippne isppne psipne spipne pispne ipspne sippne isppne ppsnie ppsnie pspnie sppnie pspnie sppnie ppnsie ppnsie pnpsie nppsie pnpsie nppsie psnpie spnpie pnspie npspie snppie nsppie psnpie spnpie pnspie npspie snppie nsppie ppinse ppinse pipnse ippnse pipnse ippnse ppnise ppnise pnpise nppise pnpise nppise pinpse ipnpse pnipse npipse inppse nippse pinpse ipnpse pnipse npipse inppse nippse psinpe spinpe pisnpe ipsnpe sipnpe ispnpe psnipe spnipe pnsipe npsipe snpipe nspipe pinspe ipnspe pnispe npispe inpspe nipspe sinppe isnppe snippe nsippe insppe nisppe psinpe spinpe pisnpe ipsnpe sipnpe ispnpe psnipe spnipe pnsipe npsipe snpipe nspipe pinspe ipnspe pnispe npispe inpspe nipspe sinppe isnppe snippe nsippe insppe nisppe epsinp pesinp espinp sepinp pseinp speinp episnp peisnp eipsnp iepsnp piesnp ipesnp esipnp seipnp eispnp iespnp siepnp isepnp psienp spienp pisenp ipsenp sipenp ispenp epsnip pesnip espnip sepnip psenip spenip epnsip pensip enpsip nepsip pnesip npesip esnpip senpip enspip nespip snepip nsepip psneip spneip pnseip npseip snpeip nspeip epinsp peinsp eipnsp iepnsp piensp ipensp epnisp penisp enpisp nepisp pneisp npeisp einpsp ienpsp enipsp neipsp inepsp niepsp pinesp ipnesp pniesp npiesp inpesp nipesp esinpp seinpp eisnpp iesnpp sienpp isenpp esnipp senipp ensipp nesipp sneipp nseipp einspp ienspp enispp neispp inespp niespp sinepp isnepp sniepp nsiepp insepp nisepp psinep spinep pisnep ipsnep sipnep ispnep psniep spniep pnsiep npsiep snpiep nspiep pinsep ipnsep pnisep npisep inpsep nipsep sinpep isnpep snipep nsipep inspep nispep
Note: these 'words' (valid or invalid) are all the permutations of the word pepsin. These words are obtained by scrambling the letters in pepsin.