yacks aycks ycaks cyaks acyks cayks yakcs aykcs ykacs kyacs akycs kaycs yckas cykas ykcas kycas ckyas kcyas ackys cakys akcys kacys ckays kcays yacsk aycsk ycask cyask acysk caysk yasck aysck ysack syack asyck sayck ycsak cysak yscak sycak csyak scyak acsyk casyk ascyk sacyk csayk scayk yaksc ayksc ykasc kyasc akysc kaysc yaskc ayskc ysakc syakc asykc saykc yksac kysac yskac sykac ksyac skyac aksyc kasyc askyc sakyc ksayc skayc ycksa cyksa ykcsa kycsa ckysa kcysa ycska cyska yscka sycka csyka scyka yksca kysca yskca sykca ksyca skyca cksya kcsya cskya sckya kscya skcya acksy caksy akcsy kacsy ckasy kcasy acsky casky ascky sacky csaky scaky akscy kascy askcy sakcy ksacy skacy cksay kcsay cskay sckay kscay skcay
Note: these 'words' (valid or invalid) are all the permutations of the word yacks. These words are obtained by scrambling the letters in yacks.