kcast ckast kacst akcst cakst ackst kcsat cksat kscat skcat cskat sckat kasct aksct ksact skact askct sakct caskt acskt csakt scakt asckt sackt kcats ckats kacts akcts cakts ackts kctas cktas ktcas tkcas ctkas tckas katcs aktcs ktacs tkacs atkcs takcs catks actks ctaks tcaks atcks tacks kcsta cksta kscta skcta cskta sckta kctsa cktsa ktcsa tkcsa ctksa tcksa kstca sktca ktsca tksca stkca tskca cstka sctka ctska tcska stcka tscka kastc akstc ksatc skatc asktc saktc katsc aktsc ktasc tkasc atksc taksc kstac sktac ktsac tksac stkac tskac astkc satkc atskc taskc stakc tsakc castk acstk csatk scatk asctk sactk catsk actsk ctask tcask atcsk tacsk cstak sctak ctsak tcsak stcak tscak astck satck atsck tasck stack tsack
Note: these 'words' (valid or invalid) are all the permutations of the word kcast. These words are obtained by scrambling the letters in kcast.