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