rivel irvel rviel vriel ivrel virel rievl irevl reivl erivl iervl eirvl rveil vreil revil ervil veril evril iverl vierl ievrl eivrl veirl evirl rivle irvle rvile vrile ivrle virle rilve irlve rlive lrive ilrve lirve rvlie vrlie rlvie lrvie vlrie lvrie ivlre vilre ilvre livre vlire lvire rielv irelv reilv erilv ierlv eirlv rilev irlev rliev lriev ilrev lirev reliv erliv rleiv lreiv elriv leriv ielrv eilrv ilerv lierv elirv leirv rveli vreli revli ervli verli evrli rvlei vrlei rlvei lrvei vlrei lvrei relvi erlvi rlevi lrevi elrvi lervi velri evlri vleri lveri elvri levri ivelr vielr ievlr eivlr veilr evilr ivler viler ilver liver vlier lvier ielvr eilvr ilevr lievr elivr leivr velir evlir vleir lveir elvir levir
Note: these 'words' (valid or invalid) are all the permutations of the word rivel. These words are obtained by scrambling the letters in rivel.