a-a a-c aaa aac aaf aar aau ac- aca acc acf acr acu af- afa afc aff afr afu ar- ara arc arf arr aru au- aua auc auf aur c-- caa cac caf car cau cca ccc ccf ccr ccu cfa cfc cff cfr cfu cra crc crf crr cru cua cuc cuf cur cuu faa fac faf far fau fca fcc fcf fcr fcu ffa ffc fff ffr ffu fra frc frf frr fru fua fuf fur fuu ra- raa rac raf rar rau rca rcc rcf rcr rcu rfa rfc rff rfr rfu rra rrc rrf rrr rru rua ruc ruf rur ruu ua- uaa uac uaf uar uau uca ucc ucf ucr ucu ufa ufc uff ufr ufu ur- ura urc urf urr uru uua uuc uur uuu