sluff lsuff sulff uslff lusff ulsff slfuf lsfuf sfluf fsluf lfsuf flsuf suflf usflf sfulf fsulf ufslf fuslf lufsf ulfsf lfusf flusf uflsf fulsf sluff lsuff sulff uslff lusff ulsff slfuf lsfuf sfluf fsluf lfsuf flsuf suflf usflf sfulf fsulf ufslf fuslf lufsf ulfsf lfusf flusf uflsf fulsf slffu lsffu sflfu fslfu lfsfu flsfu slffu lsffu sflfu fslfu lfsfu flsfu sfflu fsflu sfflu fsflu ffslu ffslu lffsu flfsu lffsu flfsu fflsu fflsu suffl usffl sfufl fsufl ufsfl fusfl suffl usffl sfufl fsufl ufsfl fusfl sfful fsful sfful fsful ffsul ffsul uffsl fufsl uffsl fufsl ffusl ffusl luffs ulffs lfufs flufs uflfs fulfs luffs ulffs lfufs flufs uflfs fulfs lffus flfus lffus flfus fflus fflus uffls fufls uffls fufls ffuls ffuls
Note: these 'words' (valid or invalid) are all the permutations of the word sluff. These words are obtained by scrambling the letters in sluff.