rives irves rvies vries ivres vires rievs irevs reivs erivs iervs eirvs rveis vreis revis ervis veris evris ivers viers ievrs eivrs veirs evirs rivse irvse rvise vrise ivrse virse risve irsve rsive srive isrve sirve rvsie vrsie rsvie srvie vsrie svrie ivsre visre isvre sivre vsire svire riesv iresv reisv erisv iersv eirsv risev irsev rsiev sriev isrev sirev resiv ersiv rseiv sreiv esriv seriv iesrv eisrv iserv sierv esirv seirv rvesi vresi revsi ervsi versi evrsi rvsei vrsei rsvei srvei vsrei svrei resvi ersvi rsevi srevi esrvi servi vesri evsri vseri sveri esvri sevri ivesr viesr ievsr eivsr veisr evisr ivser viser isver siver vsier svier iesvr eisvr isevr sievr esivr seivr vesir evsir vseir sveir esvir sevir
Note: these 'words' (valid or invalid) are all the permutations of the word rives. These words are obtained by scrambling the letters in rives.