cowk ocwk cwok wcok owck wock cokw ockw ckow kcow okcw kocw cwko wcko ckwo kcwo wkco kwco owkc wokc okwc kowc wkoc kwoc
Note: these 'words' (valid or invalid) are all the permutations of the word cowk. These words are obtained by scrambling the letters in cowk.