a-ak a-ok aaaa aaac aaaf aaar aaca aacc aacf aack aaco aacr aafa aafc aaff aaka aaoo aara aarc aaro acaa acac acar acca accc accf acco acfc acoa acor acr- acra acrc acro acrr afaa afak afao afar afca afcc affa affc affo afka afkr afoa afoo afor afr- afra afrc afro akaa akao akar akca akka akko akok akr- akra aoca aora arac araf arak arar arc- arca arco arfa arfc arff arka arko aroa aroo aror arr- arra arrc arrk arro arrr caaa caac caaf cac- caca cacc cack caco cacr cafa cafc caff caka caor cara carc carf cark caro carr ccaa ccac ccaf ccar ccca cccc cccf ccfa ccfc ccff ccoc ccra ccrc ccrf cfaa cfac cfao cfar cfca cfcf cfco cffr cfoa cfor cfra ckac ckck ckco ckfr ckoa ckoc ckoo ckor ckrc coak coca cock coco cofc coff cok- coka coko coof cook cor- cora corc corf cork coro corr crac craf crar crca crcc crcr crfc crkc croc crok croo cror f--k faaa faac faca facc fack fafa fafc faff fafo fako fara farc fark faro farr fcar fcca fccf fcra ffar ffcc ffff ffrr foaf foak foar foca fock foco fofo foof fook for- fora fork foro forr frac frak frcc frfc kaaa kaaf kaak kaar kacc kaco kafa kafc kaff kafr kaka kakc kakk kako kaoa kaoc kaok kaor kara karf kark karo karr kcaa kcac kcar kcca kccc kcck kccr kcfa kcfc kcfo kckc kckf kckk kcko kckr kcof kcor kcrc kcro kcrr kfac kfar kfcf kfco kfcr kffa kfff kffk kfka kfok kfoo kfor kfra kfrc kfro kfrr kkaa kkac kkar kkck kkco kkcr kkfr kkkk kkoa kkoo kkor kkrc kkrf kkrk kkro kkrr koac koak koar koca kocf kock kofa kofc koff kofk kofo koka kokc kokf kokk koko kokr kooc kook kooo koor kora korc korf kork koro korr krac krak krar krca krcc krco krfc krff krfo krka krkc krkk krko krkr kroa kroc krof krok kroo kror krrc krrf krrk krro krrr oafc oafo oara ocac ocak occa occc ocfa ocra ocro ocrr ofcr off- offa offc offo offr ofor ofra okak okka okko okok okor okra okro ooaa ooak oocr ooff oooo oora orac orak orao orar orca orco orff orka orko oro- orof orok oror orra orro raaf raak rac- raca racc rack raco rafa rafc raff raka rakk raoc raok rara rarf rark raro rcac rcaf rccc rcfc rffc rkkf roaf roak roar roca rocc rock roco rofc roff rofo roka rokk roko rokr roof rook roor rora rorc rork roro rrfc rrrr