a-a a-c aaa aac aak aao aar aau ac- aca acc ack aco acr acu aka akc akk ako akr aku aoa aoc aok aoo aor aou ar- ara arc ark aro arr aru au- aua auc auk auo aur c-- caa cac cak cao car cau cca ccc cck cco ccr ccu cka ckc cko co- coa coc cok coo cor cou cra crc crk cro crr cru cua cuc cuk cuo cur cuu ka- kaa kac kak kao kar kau kca kcc kck kcr kcu kkc kkk kkr kku koa koc kok koo kor kou kra krc krk kro krr kru kuc kuk kur kuu oaa oac oak oao oar oau oc- oca occ ock oco ocr ocu oka okc okk oko okr oku oo- ooa ooc ook ooo oor or- ora orc ork oro orr oru ou- oua ouc ouk ouo our ra- raa rac rak rao rar rau rca rcc rco rcr rcu rkc rkk rko rku roa roc rok roo ror rou rra rrc rrk rrr rru rua ruc ruk ruo rur ruu ua- uaa uac uak uao uar uau uca ucc uck uco ucr ucu uka ukc ukk ukr uku uoa uoc uok uoo uor ur- ura urc urk uro urr uru uua uuc uur uuu