sluft lsuft sulft uslft lusft ulsft slfut lsfut sflut fslut lfsut flsut suflt usflt sfult fsult ufslt fuslt lufst ulfst lfust flust uflst fulst slutf lsutf sultf usltf lustf ulstf sltuf lstuf stluf tsluf ltsuf tlsuf sutlf ustlf stulf tsulf utslf tuslf lutsf ultsf ltusf tlusf utlsf tulsf slftu lsftu sfltu fsltu lfstu flstu sltfu lstfu stlfu tslfu ltsfu tlsfu sftlu fstlu stflu tsflu ftslu tfslu lftsu fltsu ltfsu tlfsu ftlsu tflsu suftl usftl sfutl fsutl ufstl fustl sutfl ustfl stufl tsufl utsfl tusfl sftul fstul stful tsful ftsul tfsul uftsl futsl utfsl tufsl ftusl tfusl lufts ulfts lfuts fluts uflts fults lutfs ultfs ltufs tlufs utlfs tulfs lftus fltus ltfus tlfus ftlus tflus uftls futls utfls tufls ftuls tfuls
Note: these 'words' (valid or invalid) are all the permutations of the word sluft. These words are obtained by scrambling the letters in sluft.