kkkk kknn kkno kkon kkoo kkor kkov kkrk kkrn kkro kkrr kkrv kkvr kkvv knkk knnk knnr knok knon knor knrk knro knrv knvn knvo knvr kokk kokn koko kokr konk kono kook koon kooo koor koov kork korn koro korr korv kovk kovo kovr krkk krkn krko krkr krkv krnk krnn krno krnv krok kroo kror krov krrk krrn krro krrr krvk krvn krvo krvr krvv kvnn kvno kvnr kvok kvon kvoo kvor kvov kvro kvrr kvrv kvvn kvvr kvvv nkok nkor nnnn noko non- nonn nono noo- nook noon nooo noor noov nor- nork norn noro norr norv nov- novo nron okko okno okok okon okor okro onno onon onor oooo orko orno oro- orok oron oror orro orvr ovo- ovon ovoo rokk roko rokr ronk rono rook roon roor rork roro rovo rrrr vkor vonk vonn voor vor- voro vovk vrnn vron vvvv