a-a a-c aaa aac aaf aar aas aau ac- aca acc acf acr acs acu af- afa afc aff afr afs afu ar- ara arc arf arr ars aru as- asa asc asf asr ass asu au- aua auc auf aur aus c-- caa cac caf car cas cau cca ccc ccf ccr ccs ccu cfa cfc cff cfr cfs cfu cra crc crf crr crs cru csa csc csf csr css csu cua cuc cuf cur cus cuu faa fac faf far fas fau fca fcc fcf fcr fcs fcu ffa ffc fff ffr ffs ffu fra frc frf frr frs fru fsa fsc fsf fsr fss fsu fua fuf fur fus fuu ra- raa rac raf rar ras rau rca rcc rcf rcr rcs rcu rfa rfc rff rfr rfs rfu rra rrc rrf rrr rrs rru rsa rsc rsf rsr rss rsu rua ruc ruf rur rus ruu saa sac saf sar sas sau sca scc scf scr scs scu sfa sfc sff sfr sfs sfu sr- sra src srf srr srs ss- ssa ssc ssf ssr sss ssu sua suc suf sur sus suu ua- uaa uac uaf uar uas uau uca ucc ucf ucr ucs ucu ufa ufc uff ufr ufs ufu ur- ura urc urf urr urs uru usa usc usf usr uss usu uua uuc uur uus uuu