karks akrks kraks rkaks arkks rakks kakrs akkrs kkars kkars akkrs kakrs krkas rkkas kkras kkras rkkas krkas arkks rakks akrks karks rkaks kraks karsk akrsk krask rkask arksk raksk kasrk aksrk ksark skark askrk sakrk krsak rksak ksrak skrak rskak srkak arskk raskk asrkk sarkk rsakk srakk kaksr akksr kkasr kkasr akksr kaksr kaskr akskr ksakr skakr askkr sakkr kksar kksar kskar skkar kskar skkar akskr kaskr askkr sakkr ksakr skakr krksa rkksa kkrsa kkrsa rkksa krksa krska rkska ksrka skrka rskka srkka kksra kksra kskra skkra kskra skkra rkska krska rskka srkka ksrka skrka arksk raksk akrsk karsk rkask krask arskk raskk asrkk sarkk rsakk srakk aksrk kasrk askrk sakrk ksark skark rksak krsak rskak srkak ksrak skrak
Note: these 'words' (valid or invalid) are all the permutations of the word karks. These words are obtained by scrambling the letters in karks.