doffs odffs dfofs fdofs ofdfs fodfs doffs odffs dfofs fdofs ofdfs fodfs dffos fdfos dffos fdfos ffdos ffdos offds fofds offds fofds ffods ffods dofsf odfsf dfosf fdosf ofdsf fodsf dosff odsff dsoff sdoff osdff sodff dfsof fdsof dsfof sdfof fsdof sfdof ofsdf fosdf osfdf sofdf fsodf sfodf dofsf odfsf dfosf fdosf ofdsf fodsf dosff odsff dsoff sdoff osdff sodff dfsof fdsof dsfof sdfof fsdof sfdof ofsdf fosdf osfdf sofdf fsodf sfodf dffso fdfso dffso fdfso ffdso ffdso dfsfo fdsfo dsffo sdffo fsdfo sfdfo dfsfo fdsfo dsffo sdffo fsdfo sfdfo ffsdo ffsdo fsfdo sffdo fsfdo sffdo offsd fofsd offsd fofsd ffosd ffosd ofsfd fosfd osffd soffd fsofd sfofd ofsfd fosfd osffd soffd fsofd sfofd ffsod ffsod fsfod sffod fsfod sffod
Note: these 'words' (valid or invalid) are all the permutations of the word doffs. These words are obtained by scrambling the letters in doffs.