kacks akcks kcaks ckaks ackks cakks kakcs akkcs kkacs kkacs akkcs kakcs kckas ckkas kkcas kkcas ckkas kckas ackks cakks akcks kacks ckaks kcaks kacsk akcsk kcask ckask acksk caksk kasck aksck ksack skack askck sakck kcsak cksak kscak skcak cskak sckak acskk caskk asckk sackk csakk scakk kaksc akksc kkasc kkasc akksc kaksc kaskc akskc ksakc skakc askkc sakkc kksac kksac kskac skkac kskac skkac akskc kaskc askkc sakkc ksakc skakc kcksa ckksa kkcsa kkcsa ckksa kcksa kcska ckska kscka skcka cskka sckka kksca kksca kskca skkca kskca skkca ckska kcska cskka sckka kscka skcka acksk caksk akcsk kacsk ckask kcask acskk caskk asckk sackk csakk scakk aksck kasck askck sakck ksack skack cksak kcsak cskak sckak kscak skcak
Note: these 'words' (valid or invalid) are all the permutations of the word kacks. These words are obtained by scrambling the letters in kacks.