geck egck gcek cgek ecgk cegk gekc egkc gkec kgec ekgc kegc gcke cgke gkce kgce ckge kcge eckg cekg ekcg kecg ckeg kceg
Note: these 'words' (valid or invalid) are all the permutations of the word geck. These words are obtained by scrambling the letters in geck.