facbe afcbe fcabe cfabe acfbe cafbe fabce afbce fbace bface abfce bafce fcbae cfbae fbcae bfcae cbfae bcfae acbfe cabfe abcfe bacfe cbafe bcafe faceb afceb fcaeb cfaeb acfeb cafeb faecb afecb feacb efacb aefcb eafcb fceab cfeab fecab efcab cefab ecfab acefb caefb aecfb eacfb ceafb ecafb fabec afbec fbaec bfaec abfec bafec faebc afebc feabc efabc aefbc eafbc fbeac bfeac febac efbac befac ebfac abefc baefc aebfc eabfc beafc ebafc fcbea cfbea fbcea bfcea cbfea bcfea fceba cfeba fecba efcba cefba ecfba fbeca bfeca febca efbca befca ebfca cbefa bcefa cebfa ecbfa becfa ebcfa acbef cabef abcef bacef cbaef bcaef acebf caebf aecbf eacbf ceabf ecabf abecf baecf aebcf eabcf beacf ebacf cbeaf bceaf cebaf ecbaf becaf ebcaf
Note: these 'words' (valid or invalid) are all the permutations of the word facbe. These words are obtained by scrambling the letters in facbe.