ftail tfail fatil aftil tafil atfil ftial tfial fital iftal tifal itfal faitl afitl fiatl ifatl aiftl iaftl taifl atifl tiafl itafl aitfl iatfl ftali tfali fatli aftli tafli atfli ftlai tflai fltai lftai tlfai ltfai falti aflti flati lfati alfti lafti talfi atlfi tlafi ltafi altfi latfi ftila tfila fitla iftla tifla itfla ftlia tflia fltia lftia tlfia ltfia filta iflta flita lfita ilfta lifta tilfa itlfa tlifa ltifa iltfa litfa failt afilt fialt ifalt aiflt iaflt falit aflit flait lfait alfit lafit filat iflat fliat lfiat ilfat lifat ailft ialft alift laift ilaft liaft tailf atilf tialf italf aitlf iatlf talif atlif tlaif ltaif altif latif tilaf itlaf tliaf ltiaf iltaf litaf ailtf ialtf alitf laitf ilatf liatf
Note: these 'words' (valid or invalid) are all the permutations of the word ftail. These words are obtained by scrambling the letters in ftail.