a-a a-c aaa aac aao aar aau ac- aca acc aco acr acu aoa aoc aoo aor aou ar- ara arc aro arr aru au- aua auc auo aur c-- caa cac cao car cau cca ccc cco ccr ccu co- coa coc coo cor cou cra crc cro crr cru cua cuc cuo cur cuu oaa oac oao oar oau oc- oca occ oco ocr ocu oo- ooa ooc ooo oor or- ora orc oro orr oru ou- oua ouc ouo our ra- raa rac rao rar rau rca rcc rco rcr rcu roa roc roo ror rou rra rrc rrr rru rua ruc ruo rur ruu ua- uaa uac uao uar uau uca ucc uco ucr ucu uoa uoc uoo uor ur- ura urc uro urr uru uua uuc uur uuu