feck efck fcek cfek ecfk cefk fekc efkc fkec kfec ekfc kefc fcke cfke fkce kfce ckfe kcfe eckf cekf ekcf kecf ckef kcef
Note: these 'words' (valid or invalid) are all the permutations of the word feck. These words are obtained by scrambling the letters in feck.