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