a-ak aaaa aaac aaad aaae aaaf aaca aacc aacd aace aacf aack aada aadc aade aaea aaec aafa aafc aafd aaff aaka aake acaa acac acad acae acca accc accd acce accf acda acdc acde acdf ace- acea acec aced acek acfc acfd acfe ackd acke adaa adac adad adae adak adcc adda addc addd adde adea adee adfa adfc aeac aeaf aede aeka afaa afad afak afca afcc afdc afee afek affa affc afka akaa akae akca aked akee akka c-cd caaa caac caaf cac- caca cacc cace cack cada cadc cadd cade caec cafa cafc cafe caff caka cake ccaa ccac ccad ccaf ccca cccc cccf ccdc ccdf cced ccee ccfa ccfc ccfd ccff cd-e cdaa cdac cdad cdda cdec cdef cdfa cdfe ceac cead cec- ceca cece ceda cedd cede ceec cef- cefa cefc ceke cfaa cfac cfae cfca cfcf cfda ckac ckck daad daae daca dace dada dade dafa dafc dafe daff daka dake dcca dccc dcfc dddd deac dead deae deaf deak dec- deca decc decd dece deck deda dedd dede deed deef deek defe deff dek- deka deke dfaf dfcc dffa dkdc eaaf eaca eacc eada eadd eaec ecaa ecac ecad ecca eccc ecce ecdc ecdf eced ecef ecfa ecfc ecka edac edad edca edda eddc edde ede- edea edfa eeca eede eeea eeee eefa eefe eeka eeke efca efda effa efke eka- eked ekek ekfc ekka f--k faaa faac faad faca facc face fack fada fadd fade fafa fafc fafe faff fake fcca fccf fcda fdca fead feaf feak fece feck feda fede feed feek fefc fefe feff feke ffcc ffee ffff kaaa kaaf kaak kacc kacd kace kad- kada kadd kade kadf kafa kafc kafe kaff kaka kakc kake kakk kcaa kcac kcad kcca kccc kccd kcck kcda kcdc kcdd kcea kcec kced kcee kcfa kcfc kcfd kckc kckf kckk kdaa kdac kdad kdae kdaf kdak kdca kdcc kdcd kdce kddc kddd kddf kddk kdec kdef kdfc kdka kdkd kdkk kea- kead keak keca keck keda kedc kedd kede keed keef keek kefa kefc keff keka kekc keke kfac kfcd kfcf kfda kfed kffa kfff kffk kfka kkaa kkac kkcd kkck kkda kkdc kkdd kkea kked kkkk