fault afult fualt ufalt auflt uaflt falut aflut flaut lfaut alfut lafut fulat uflat fluat lfuat ulfat lufat aulft ualft aluft lauft ulaft luaft fautl afutl fuatl ufatl auftl uaftl fatul aftul ftaul tfaul atful taful futal uftal ftual tfual utfal tufal autfl uatfl atufl taufl utafl tuafl faltu afltu flatu lfatu alftu laftu fatlu aftlu ftalu tfalu atflu taflu fltau lftau ftlau tflau ltfau tlfau altfu latfu atlfu talfu ltafu tlafu fulta uflta fluta lfuta ulfta lufta futla uftla ftula tfula utfla tufla fltua lftua ftlua tflua ltfua tlfua ultfa lutfa utlfa tulfa ltufa tlufa aultf ualtf alutf lautf ulatf luatf autlf uatlf atulf taulf utalf tualf altuf latuf atluf taluf ltauf tlauf ultaf lutaf utlaf tulaf ltuaf tluaf
Note: these 'words' (valid or invalid) are all the permutations of the word fault. These words are obtained by scrambling the letters in fault.