a-a a-c aaa aac aao aar aas aau ac- aca acc aco acr acs acu aoa aoc aoo aor aos aou ar- ara arc aro arr ars aru as- asa asc aso asr ass asu au- aua auc auo aur aus c-- caa cac cao car cas cau cca ccc cco ccr ccs ccu co- coa coc coo cor cos cou cra crc cro crr crs cru csa csc cso csr css csu cua cuc cuo cur cus cuu oaa oac oao oar oas oau oc- oca occ oco ocr ocs ocu oo- ooa ooc ooo oor oos or- ora orc oro orr ors oru os- osa osc oso osr oss osu ou- oua ouc ouo our ous ra- raa rac rao rar ras rau rca rcc rco rcr rcs rcu roa roc roo ror ros rou rra rrc rrr rrs rru rsa rsc rso rsr rss rsu rua ruc ruo rur rus ruu saa sac sao sar sas sau sca scc sco scr scs scu soa soc soo sor sos sou sr- sra src sro srr srs ss- ssa ssc sso ssr sss ssu sua suc suo sur sus suu ua- uaa uac uao uar uas uau uca ucc uco ucr ucs ucu uoa uoc uoo uor uos ur- ura urc uro urr urs uru usa usc uso usr uss usu uua uuc uur uus uuu