bobac obbac bboac bboac obbac bobac boabc obabc baobc abobc oabbc aobbc bbaoc bbaoc baboc abboc baboc abboc obabc boabc oabbc aobbc baobc abobc bobca obbca bboca bboca obbca bobca bocba obcba bcoba cboba ocbba cobba bbcoa bbcoa bcboa cbboa bcboa cbboa obcba bocba ocbba cobba bcoba cboba boacb obacb baocb abocb oabcb aobcb bocab obcab bcoab cboab ocbab cobab bacob abcob bcaob cbaob acbob cabob oacbb aocbb ocabb coabb acobb caobb bbaco bbaco babco abbco babco abbco bbcao bbcao bcbao cbbao bcbao cbbao bacbo abcbo bcabo cbabo acbbo cabbo bacbo abcbo bcabo cbabo acbbo cabbo obacb boacb oabcb aobcb baocb abocb obcab bocab ocbab cobab bcoab cboab oacbb aocbb ocabb coabb acobb caobb bacob abcob bcaob cbaob acbob cabob
Note: these 'words' (valid or invalid) are all the permutations of the word bobac. These words are obtained by scrambling the letters in bobac.