karst akrst krast rkast arkst rakst kasrt aksrt ksart skart askrt sakrt krsat rksat ksrat skrat rskat srkat arskt raskt asrkt sarkt rsakt srakt karts akrts krats rkats arkts rakts katrs aktrs ktars tkars atkrs takrs krtas rktas ktras tkras rtkas trkas artks ratks atrks tarks rtaks traks kastr akstr ksatr skatr asktr saktr katsr aktsr ktasr tkasr atksr taksr kstar sktar ktsar tksar stkar tskar astkr satkr atskr taskr stakr tsakr krsta rksta ksrta skrta rskta srkta krtsa rktsa ktrsa tkrsa rtksa trksa kstra sktra ktsra tksra stkra tskra rstka srtka rtska trska strka tsrka arstk rastk asrtk sartk rsatk sratk artsk ratsk atrsk tarsk rtask trask astrk satrk atsrk tasrk stark tsark rstak srtak rtsak trsak strak tsrak
Note: these 'words' (valid or invalid) are all the permutations of the word karst. These words are obtained by scrambling the letters in karst.