riven irven rvien vrien ivren viren rievn irevn reivn erivn iervn eirvn rvein vrein revin ervin verin evrin ivern viern ievrn eivrn veirn evirn rivne irvne rvine vrine ivrne virne rinve irnve rnive nrive inrve nirve rvnie vrnie rnvie nrvie vnrie nvrie ivnre vinre invre nivre vnire nvire rienv irenv reinv erinv iernv eirnv rinev irnev rniev nriev inrev nirev reniv erniv rneiv nreiv enriv neriv ienrv einrv inerv nierv enirv neirv rveni vreni revni ervni verni evrni rvnei vrnei rnvei nrvei vnrei nvrei renvi ernvi rnevi nrevi enrvi nervi venri evnri vneri nveri envri nevri ivenr vienr ievnr eivnr veinr evinr ivner viner inver niver vnier nvier ienvr einvr inevr nievr enivr neivr venir evnir vneir nveir envir nevir
Note: these 'words' (valid or invalid) are all the permutations of the word riven. These words are obtained by scrambling the letters in riven.