fells eflls flels lfels elfls lefls fells eflls flels lfels elfls lefls flles lfles flles lfles llfes llfes ellfs lelfs ellfs lelfs llefs llefs felsl eflsl flesl lfesl elfsl lefsl fesll efsll fsell sfell esfll sefll flsel lfsel fslel sflel lsfel slfel elsfl lesfl eslfl selfl lsefl slefl felsl eflsl flesl lfesl elfsl lefsl fesll efsll fsell sfell esfll sefll flsel lfsel fslel sflel lsfel slfel elsfl lesfl eslfl selfl lsefl slefl fllse lflse fllse lflse llfse llfse flsle lfsle fslle sflle lsfle slfle flsle lfsle fslle sflle lsfle slfle llsfe llsfe lslfe sllfe lslfe sllfe ellsf lelsf ellsf lelsf llesf llesf elslf leslf esllf sellf lself slelf elslf leslf esllf sellf lself slelf llsef llsef lslef sllef lslef sllef
Note: these 'words' (valid or invalid) are all the permutations of the word fells. These words are obtained by scrambling the letters in fells.