sprew psrew srpew rspew prsew rpsew sperw pserw seprw esprw pesrw epsrw srepw rsepw serpw esrpw respw erspw presw rpesw persw eprsw repsw erpsw sprwe psrwe srpwe rspwe prswe rpswe spwre pswre swpre wspre pwsre wpsre srwpe rswpe swrpe wsrpe rwspe wrspe prwse rpwse pwrse wprse rwpse wrpse spewr psewr sepwr espwr peswr epswr spwer pswer swper wsper pwser wpser sewpr eswpr swepr wsepr ewspr wespr pewsr epwsr pwesr wpesr ewpsr wepsr srewp rsewp serwp esrwp reswp erswp srwep rswep swrep wsrep rwsep wrsep sewrp eswrp swerp wserp ewsrp wesrp rewsp erwsp rwesp wresp ewrsp wersp prews rpews perws eprws repws erpws prwes rpwes pwres wpres rwpes wrpes pewrs epwrs pwers wpers ewprs weprs rewps erwps rweps wreps ewrps werps
Note: these 'words' (valid or invalid) are all the permutations of the word sprew. These words are obtained by scrambling the letters in sprew.