a-ak aaaa aaac aaae aaar aaca aacc aace aack aacr aaea aaec aaka aake aara aarc aare acaa acac acae acar acca accc acce ace- acea acec acek acer acke acr- acra acrc acre acrr aeac aeer aeka aer- aera aerc akaa akae akar akca akee aker akka akr- akra akre arac arae arak arar arc- arca arce area arec aree arek arka arke arr- arra arrc arre arrk arrr caaa caac cac- caca cacc cace cack cacr caec caer caka cake cara carc care cark carr ccaa ccac ccar ccca cccc ccee ccra ccrc ccre ceac cear cec- ceca cece ceec ceke cer- cera cerc cere ckac ckck cker ckrc crac crar crca crcc crce crcr cre- crea crec cree crkc eaca eacc eaec eara eare ecaa ecac ecar ecca eccc ecce ecka ecra ecrc ecrr eeca eeea eeee eeka eeke eera eerc eka- ekek eker ekka erca ercc erce erec erer erke erra errc erre kaaa kaak kaar kacc kace kaer kaka kakc kake kakk kara kare kark karr kcaa kcac kcar kcca kccc kcck kccr kcea kcec kcee kckc kckk kckr kcrc kcrr kea- keak kear keca keck kecr keek keer keka kekc keke ker- kera kerc kere kerk kerr kkaa kkac kkar kkck kkcr kkea kkkk kkrc kkre kkrk kkrr krac krae krak krar krca krcc krce krea krec kree krek krka krkc krke krkk krkr krrc krre krrk krrr raak rac- raca racc race rack raec raer raka rake rakk rara rare rark rcac rccc rea- reac reae reak rear reca recc rece reck recr reek reka reke rera rere rrrr