pends epnds pneds npeds enpds nepds pedns epdns pdens dpens edpns depns pndes npdes pdnes dpnes ndpes dnpes endps nedps ednps denps ndeps dneps pensd epnsd pnesd npesd enpsd nepsd pesnd epsnd psend spend espnd sepnd pnsed npsed psned spned nsped snped enspd nespd esnpd senpd nsepd snepd pedsn epdsn pdesn dpesn edpsn depsn pesdn epsdn psedn spedn espdn sepdn pdsen dpsen psden spden dspen sdpen edspn despn esdpn sedpn dsepn sdepn pndse npdse pdnse dpnse ndpse dnpse pnsde npsde psnde spnde nspde snpde pdsne dpsne psdne spdne dspne sdpne ndspe dnspe nsdpe sndpe dsnpe sdnpe endsp nedsp ednsp densp ndesp dnesp ensdp nesdp esndp sendp nsedp snedp edsnp desnp esdnp sednp dsenp sdenp ndsep dnsep nsdep sndep dsnep sdnep
Note: these 'words' (valid or invalid) are all the permutations of the word pends. These words are obtained by scrambling the letters in pends.