tafec atfec tfaec ftaec aftec fatec taefc atefc teafc etafc aetfc eatfc tfeac fteac tefac etfac fetac eftac afetc faetc aeftc eaftc featc efatc tafce atfce tface ftace aftce fatce tacfe atcfe tcafe ctafe actfe catfe tfcae ftcae tcfae ctfae fctae cftae afcte facte acfte cafte fcate cfate taecf atecf teacf etacf aetcf eatcf tacef atcef tcaef ctaef actef catef tecaf etcaf tceaf cteaf ectaf cetaf aectf eactf acetf caetf ecatf ceatf tfeca fteca tefca etfca fetca eftca tfcea ftcea tcfea ctfea fctea cftea tecfa etcfa tcefa ctefa ectfa cetfa fecta efcta fceta cfeta ecfta cefta afect faect aefct eafct feact efact afcet facet acfet cafet fcaet cfaet aecft eacft aceft caeft ecaft ceaft fecat efcat fceat cfeat ecfat cefat
Note: these 'words' (valid or invalid) are all the permutations of the word tafec. These words are obtained by scrambling the letters in tafec.