a-ak a-do a-ok aaaa aaac aaad aaca aacc aacd aack aaco aada aadc aaka aaoo acaa acac acad acca accc accd acco acda acdc ackd acoa acod adaa adac adad adak adao adcc adda addc addd addo adoc adod adok adoo akaa akao akca akka akko akok aoca c-cd caaa caac cac- caca cacc cack caco cada cadc cadd cado caka caod ccaa ccac ccad ccca cccc ccdc ccoc ccod cdaa cdac cdad cdda ckac ckck ckco ckdo ckoa ckoc ckoo coad coak coca cock coco coda codd cok- coka coko cood cook daad daca dada dado daka dako dcca dccc dddd ddoc dkdc doak doca dock doco dod- doda dodd dodo doka doko dood dook kaaa kaak kacc kacd kaco kad- kada kadd kado kaka kakc kakk kako kaoa kaoc kaok kcaa kcac kcad kcca kccc kccd kcck kcda kcdc kcdd kckc kckk kcko kdaa kdac kdad kdak kdao kdca kdcc kdcd kdco kddc kddd kddk kdka kdkd kdkk kdko kdoc kdok kkaa kkac kkcd kkck kkco kkda kkdc kkdd kkdo kkkk kkoa kkoo koac koak koca kocd kock koda kodk kodo koka kokc kokk koko kooc kook kooo ocac ocad ocak occa occc odac odda oddd odoo okak okka okko okok ooaa ooak ooda oooo