-vac a-ak a-ok aaaa aaac aaar aaav aaca aacc aack aaco aacr aacv aaka aaoo aara aarc aaro aava acaa acac acar acca accc acco acoa acor acr- acra acrc acro acrr acrv acvv akaa akao akar akca akka akko akok akr- akra aoca aora arac arak arar arc- arca arco arka arko aroa aroo aror arr- arra arrc arrk arro arrr arva arvo avao avar avcc avco avor avra avro avva avvo caaa caac cac- caca cacc cack caco cacr caka caor cara carc cark caro carr cava cavo ccaa ccac ccar ccca cccc cccv ccoc ccra ccrc ccvo ckac ckck ckco ckcv ckoa ckoc ckoo ckor ckrc ckvo coak coca cock coco cok- coka coko cook cor- cora corc cork coro corr cova covo crac crar crca crcc crcr crkc croc crok croo cror cvac cvar cvca cvcc cvra cvrr kaaa kaak kaar kacc kaco kacv kaka kakc kakk kako kaoa kaoc kaok kaor kara kark karo karr karv kava kavo kavv kcaa kcac kcar kcav kcca kccc kcck kccr kccv kckc kckk kcko kckr kckv kcor kcrc kcro kcrr kcrv kcvk kcvo kcvr kcvv kkaa kkac kkar kkck kkco kkcr kkkk kkoa kkoo kkor kkov kkrc kkrk kkro kkrr kkrv kkvr kkvv koac koak koar koca kock koka kokc kokk koko kokr kooc kook kooo koor koov kora korc kork koro korr korv kova kovc kovk kovo kovr krac krak krar krav krca krcc krco krka krkc krkk krko krkr krkv kroa kroc krok kroo kror krov krrc krrk krro krrr krva krvc krvk krvo krvr krvv kvak kvar kvcc kvck kvco kvcr kvcv kvoa kvoc kvok kvoo kvor kvov kvra kvrc kvro kvrr kvrv kvvr kvvv oara ocac ocak occa occc ocra ocro ocrr okak okka okko okok okor okra okro ooaa ooak oocr oooo oora orac orak orao orar orav orca orco orka orko oro- orok oror orra orro orvr ovar ovo- ovoo ovra raak rac- raca racc rack raco racv raka rakk raoc raok rara rark raro rava rcac rccc rcvr roak roar roca rocc rock roco roka rokk roko rokr rook roor rora rorc rork roro rova rovo rrrr rv-c rvca vaar vaca vack vaco vaka vara vark varr vava vkor voar voca voka vooc voor vor- vora voro vovk vrac vrak vrav vroc vvvv