silef islef slief lsief ilsef lisef sielf iself seilf esilf ieslf eislf sleif lseif selif eslif lesif elsif ilesf liesf ielsf eilsf leisf elisf silfe islfe slife lsife ilsfe lisfe sifle isfle sfile fsile ifsle fisle slfie lsfie sflie fslie lfsie flsie ilfse lifse iflse filse lfise flise siefl isefl seifl esifl iesfl eisfl sifel isfel sfiel fsiel ifsel fisel sefil esfil sfeil fseil efsil fesil iefsl eifsl ifesl fiesl efisl feisl slefi lsefi selfi eslfi lesfi elsfi slfei lsfei sflei fslei lfsei flsei sefli esfli sfeli fseli efsli fesli lefsi elfsi lfesi flesi eflsi felsi ilefs liefs ielfs eilfs leifs elifs ilfes lifes ifles files lfies flies iefls eifls ifels fiels efils feils lefis elfis lfeis fleis eflis felis
Note: these 'words' (valid or invalid) are all the permutations of the word silef. These words are obtained by scrambling the letters in silef.