a-ak a-do a-ok aaaa aaac aaad aaaf aaca aacc aacd aacf aack aaco aada aadc aafa aafc aafd aaff aaka aaoo acaa acac acad acca accc accd accf acco acda acdc acdf acfc acfd ackd acoa acod adaa adac adad adak adao adcc adda addc addd addo adfa adfc adoc adod adok adoo afaa afad afak afao afca afcc afdc affa affc affo afka afoa afoo akaa akao akca akka akko akok aoca c-cd caaa caac caaf cac- caca cacc cack caco cada cadc cadd cado cafa cafc caff caka caod ccaa ccac ccad ccaf ccca cccc cccf ccdc ccdf ccfa ccfc ccfd ccff ccoc ccod cdaa cdac cdad cdda cdfa cfaa cfac cfao cfca cfcf cfco cfda cfoa ckac ckck ckco ckdo ckoa ckoc ckoo coad coak coca cock coco coda codd cofc coff cok- coka coko cood coof cook daad daca dada dado dafa dafc daff dafo daka dako dcca dccc dcfc dddd ddoc dfaf dfcc dfco dffa dkdc doak doca dock doco dod- doda dodd dodo doff doka doko dood doof dook f--k faaa faac faad faca facc fack fada fadd fado fafa fafc faff fafo fako fcca fccf fcda fdca fdoa fdoc ffcc ffff foad foaf foak foca fock foco foda fofo food foof fook kaaa kaaf kaak kacc kacd kaco kad- kada kadd kadf kado kafa kafc kaff kaka kakc kakk kako kaoa kaoc kaok kcaa kcac kcad kcca kccc kccd kcck kcda kcdc kcdd kcfa kcfc kcfd kcfo kckc kckf kckk kcko kcof kdaa kdac kdad kdaf kdak kdao kdca kdcc kdcd kdco kddc kddd kddf kddk kdfc kdfo kdka kdkd kdkk kdko kdoc kdok kfac kfcd kfcf kfco kfda kffa kfff kffk kfka kfok kfoo kkaa kkac kkcd kkck kkco kkda kkdc kkdd kkdo kkkk kkoa kkoo koac koak koca kocd kocf kock koda kodk kodo kofa kofc koff kofk kofo koka kokc kokf kokk koko kooc kook kooo oafc oafo ocac ocad ocak occa occc ocfa odac odda oddd odoo off- offa offc offo okak okka okko okok ooaa ooak ooda ooff oooo