pneis npeis penis epnis nepis enpis pnies npies pines ipnes nipes inpes peins epins piens ipens eipns iepns neips enips nieps ineps einps ienps pnesi npesi pensi epnsi nepsi enpsi pnsei npsei psnei spnei nspei snpei pesni epsni pseni speni espni sepni nespi enspi nsepi snepi esnpi senpi pnise npise pinse ipnse nipse inpse pnsie npsie psnie spnie nspie snpie pisne ipsne psine spine ispne sipne nispe inspe nsipe snipe isnpe sinpe peisn episn piesn ipesn eipsn iepsn pesin epsin psein spein espin sepin pisen ipsen psien spien ispen sipen eispn iespn esipn seipn isepn siepn neisp enisp niesp inesp einsp iensp nesip ensip nseip sneip esnip senip nisep insep nsiep sniep isnep sinep eisnp iesnp esinp seinp isenp sienp
Note: these 'words' (valid or invalid) are all the permutations of the word pneis. These words are obtained by scrambling the letters in pneis.