a-ak a-ok aaaa aaac aaar aaca aacc aack aaco aacr aaka aaoo aara aarc aaro acaa acac acar acca accc acco acoa acor acr- acra acrc acro acrr 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 caaa caac cac- caca cacc cack caco cacr caka caor cara carc cark caro carr ccaa ccac ccar ccca cccc ccoc ccra ccrc ckac ckck ckco ckoa ckoc ckoo ckor ckrc coak coca cock coco cok- coka coko cook cor- cora corc cork coro corr crac crar crca crcc crcr crkc croc crok croo cror kaaa kaak kaar kacc kaco kaka kakc kakk kako kaoa kaoc kaok kaor kara kark karo karr kcaa kcac kcar kcca kccc kcck kccr kckc kckk kcko kckr kcor kcrc kcro kcrr kkaa kkac kkar kkck kkco kkcr kkkk kkoa kkoo kkor kkrc kkrk kkro kkrr koac koak koar koca kock koka kokc kokk koko kokr kooc kook kooo koor kora korc kork koro korr krac krak krar krca krcc krco krka krkc krkk krko krkr kroa kroc krok kroo kror krrc krrk krro krrr oara ocac ocak occa occc ocra ocro ocrr okak okka okko okok okor okra okro ooaa ooak oocr oooo oora orac orak orao orar orca orco orka orko oro- orok oror orra orro raak rac- raca racc rack raco raka rakk raoc raok rara rark raro rcac rccc roak roar roca rocc rock roco roka rokk roko rokr rook roor rora rorc rork roro rrrr