fends efnds fneds nfeds enfds nefds fedns efdns fdens dfens edfns defns fndes nfdes fdnes dfnes ndfes dnfes endfs nedfs ednfs denfs ndefs dnefs fensd efnsd fnesd nfesd enfsd nefsd fesnd efsnd fsend sfend esfnd sefnd fnsed nfsed fsned sfned nsfed snfed ensfd nesfd esnfd senfd nsefd snefd fedsn efdsn fdesn dfesn edfsn defsn fesdn efsdn fsedn sfedn esfdn sefdn fdsen dfsen fsden sfden dsfen sdfen edsfn desfn esdfn sedfn dsefn sdefn fndse nfdse fdnse dfnse ndfse dnfse fnsde nfsde fsnde sfnde nsfde snfde fdsne dfsne fsdne sfdne dsfne sdfne ndsfe dnsfe nsdfe sndfe dsnfe sdnfe endsf nedsf ednsf densf ndesf dnesf ensdf nesdf esndf sendf nsedf snedf edsnf desnf esdnf sednf dsenf sdenf ndsef dnsef nsdef sndef dsnef sdnef
Note: these 'words' (valid or invalid) are all the permutations of the word fends. These words are obtained by scrambling the letters in fends.