preps rpeps perps eprps repps erpps prpes rppes ppres ppres rppes prpes peprs epprs ppers ppers epprs peprs repps erpps rpeps preps eprps perps presp rpesp persp eprsp repsp erpsp prsep rpsep psrep sprep rspep srpep pesrp epsrp pserp sperp esprp seprp respp erspp rsepp srepp esrpp serpp prpse rppse pprse pprse rppse prpse prspe rpspe psrpe sprpe rsppe srppe ppsre ppsre pspre sppre pspre sppre rpspe prspe rsppe srppe psrpe sprpe pepsr eppsr ppesr ppesr eppsr pepsr pespr epspr psepr spepr esppr seppr ppser ppser psper spper psper spper epspr pespr esppr seppr psepr spepr repsp erpsp rpesp presp eprsp persp respp erspp rsepp srepp esrpp serpp rpsep prsep rspep srpep psrep sprep epsrp pesrp esprp seprp pserp sperp
Note: these 'words' (valid or invalid) are all the permutations of the word preps. These words are obtained by scrambling the letters in preps.