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