cacks accks ccaks ccaks accks cacks cakcs ackcs ckacs kcacs akccs kaccs cckas cckas ckcas kccas ckcas kccas ackcs cakcs akccs kaccs ckacs kcacs cacsk accsk ccask ccask accsk cacsk casck acsck csack scack ascck sacck ccsak ccsak cscak sccak cscak sccak acsck casck ascck sacck csack scack caksc acksc ckasc kcasc akcsc kacsc caskc acskc csakc scakc asckc sackc cksac kcsac cskac sckac kscac skcac akscc kascc askcc sakcc ksacc skacc ccksa ccksa ckcsa kccsa ckcsa kccsa ccska ccska cscka sccka cscka sccka cksca kcsca cskca sckca kscca skcca cksca kcsca cskca sckca kscca skcca acksc caksc akcsc kacsc ckasc kcasc acskc caskc asckc sackc csakc scakc akscc kascc askcc sakcc ksacc skacc cksac kcsac cskac sckac kscac skcac
Note: these 'words' (valid or invalid) are all the permutations of the word cacks. These words are obtained by scrambling the letters in cacks.