a-a a-c aaa aac aar aas aau ac- aca acc acr acs acu ar- ara arc arr ars aru as- asa asc asr ass asu au- aua auc aur aus c-- caa cac car cas cau cca ccc ccr ccs ccu cra crc crr crs cru csa csc csr css csu cua cuc cur cus cuu ra- raa rac rar ras rau rca rcc rcr rcs rcu rra rrc rrr rrs rru rsa rsc rsr rss rsu rua ruc rur rus ruu saa sac sar sas sau sca scc scr scs scu sr- sra src srr srs ss- ssa ssc ssr sss ssu sua suc sur sus suu ua- uaa uac uar uas uau uca ucc ucr ucs ucu ur- ura urc urr urs uru usa usc usr uss usu uua uuc uur uus uuu