clack lcack calck aclck lacck alcck clcak lccak cclak cclak lccak clcak caclk acclk ccalk ccalk acclk caclk lacck alcck lcack clack aclck calck clakc lcakc calkc aclkc lackc alckc clkac lckac cklac kclac lkcac klcac caklc acklc ckalc kcalc akclc kaclc lakcc alkcc lkacc klacc aklcc kalcc clcka lccka cclka cclka lccka clcka clkca lckca cklca kclca lkcca klcca cckla cckla ckcla kccla ckcla kccla lckca clkca lkcca klcca cklca kclca cackl acckl ccakl ccakl acckl cackl cakcl ackcl ckacl kcacl akccl kaccl cckal cckal ckcal kccal ckcal kccal ackcl cakcl akccl kaccl ckacl kcacl lackc alckc lcakc clakc aclkc calkc lakcc alkcc lkacc klacc aklcc kalcc lckac clkac lkcac klcac cklac kclac acklc caklc akclc kaclc ckalc kcalc
Note: these 'words' (valid or invalid) are all the permutations of the word clack. These words are obtained by scrambling the letters in clack.