a-ak a-ok aaaa aaac aaaf aaca aacc aacf aack aaco aafa aafc aaff aaka aaoo acaa acac acag acca accc accf acco acfc acga acoa acog afaa afak afao afca afcc affa affc affo afgf afka afoa afog afoo ag-o agac agag agao agca agcc agco agfa agga agog agoo akaa akao akca akka akko akok aoca caaa caac caaf cac- caca cacc cack caco cafa cafc caff caga cagg cago caka ccaa ccac ccaf ccag ccca cccc cccf ccfa ccfc ccff ccga ccgc ccoc cfaa cfac cfao cfca cfcf cfco cfgo cfoa cgac cgcc cgcg cgfc ckac ckck ckco ckga ckgo ckoa ckoc ckoo coag coak coca cock coco cofc coff cogo cok- coka coko coof cook f--k faaa faac faca facc fack fafa fafc faff fafg fafo fagg fago fako fcca fccf ffcc ffff foaf foak foca fock foco fofo fogg fogo foof fook gack gafa gafc gaff gaga gagg gago gc-c gcaa gccc gccf gcfc gcoa gfcf gffa gfoa ggfg gggg goaf goca goff goga gogo goof goog gook kaaa kaaf kaag kaak kacc kaco kafa kafc kaff kag- kaga kagc kagg kago kaka kakc kakk kako kaoa kaoc kaog kaok kcaa kcac kcca kccc kcck kcfa kcfc kcfg kcfo kcgc kcgf kckc kckf kckk kcko kcof kcog kfac kfcf kfco kffa kfff kffg kffk kfgo kfka kfog kfok kfoo kgac kgaf kgak kgcc kgfa kgff kgfk kgga kggf kggg kggo kkaa kkac kkag kkck kkco kkfg kkgo kkkk kkoa kkoo koac koak koca kocf kock kofa kofc koff kofg kofk kofo koga kogg kogo koka kokc kokf kokk koko kooc koog kook kooo oafc oafo ocac ocak occa occc ocfa ocga off- offa offc offo ofgo ogoa ogog okak okgo okka okko okok ooaa ooak ooff oooo