frown rfown forwn ofrwn rofwn orfwn frwon rfwon fwron wfron rwfon wrfon fowrn ofwrn fworn wforn owfrn wofrn rowfn orwfn rwofn wrofn owrfn worfn fronw rfonw fornw ofrnw rofnw orfnw frnow rfnow fnrow nfrow rnfow nrfow fonrw ofnrw fnorw nforw onfrw nofrw ronfw ornfw rnofw nrofw onrfw norfw frwno rfwno fwrno wfrno rwfno wrfno frnwo rfnwo fnrwo nfrwo rnfwo nrfwo fwnro wfnro fnwro nfwro wnfro nwfro rwnfo wrnfo rnwfo nrwfo wnrfo nwrfo fownr ofwnr fwonr wfonr owfnr wofnr fonwr ofnwr fnowr nfowr onfwr nofwr fwnor wfnor fnwor nfwor wnfor nwfor ownfr wonfr onwfr nowfr wnofr nwofr rownf orwnf rwonf wronf owrnf wornf ronwf ornwf rnowf nrowf onrwf norwf rwnof wrnof rnwof nrwof wnrof nwrof ownrf wonrf onwrf nowrf wnorf nworf
Note: these 'words' (valid or invalid) are all the permutations of the word frown. These words are obtained by scrambling the letters in frown.