-vac a-ak a-ok aaaa aaac aaap aaav aaca aacc aack aaco aacp aacv aaka aaoo aapa aapc aapo aava acaa acac acap acca accc acco accp acoa acop acpa acvv akaa akao akap akca akka akko akok akpo aoca aokp aopo apac apak apao apap apca apcc apco apo- apoc apoo apop appa appc avao avcc avco avva avvo caaa caac caap cac- caca cacc cack caco caka capa capc capo capp cava cavo ccaa ccac ccap ccca cccc cccp cccv ccoc ccpa ccpp ccvo ckac ckck ckco ckcv ckoa ckoc ckoo ckpc ckvo coak coca cock coco cocp cok- coka coko cook coop copa copo copp cova covo cpaa cpac cpap cpca cppa cpvc cvac cvca cvcc kaaa kaak kaap kacc kaco kacp kacv kaka kakc kakk kako kaoa kaoc kaok kap- kapa kapc kapo kapp kava kavo kavp kavv kcaa kcac kcap kcav kcca kccc kcck kccv kckc kckk kcko kckv kcpa kcpc kcpo kcvk kcvo kcvp kcvv kkaa kkac kkap kkck kkco kkkk kkoa kkoo kkov kkpc kkpk kkvv koac koak koap koca kock kocp koka kokc kokk koko kokp kooc kook kooo koop koov kopa kopp kova kovc kovk kovo kpac kpak kpao kpcc kpcv kpkk kpoa kpoc kpok kpoo kpop kppc kppk kppo kppp kppv kpvc kvak kvcc kvck kvco kvcv kvoa kvoc kvok kvoo kvop kvov kvvp kvvv ocac ocak ocap occa occc ocpa ocpp okak okap okka okko okok okpo ooaa ooak oooo opap opca opo- oppa oppo ovo- ovoo ovpp paak paap paca pack paco paka pako paoc papa papp pava pavo pcaa pcap pcca pccc pcoa pcpp poak poca pock poco poka poko pook poop pop- popa popc popo popp povo ppac ppap ppcc ppoa pppa pppo pppp pvco pvpa vaca vack vaco vaka vapa vava voca voka vooc vovk vvvv