a-a a-c aaa aac aaf aar aav ac- aca acc acf acr acv af- afa afc aff afr afv ar- ara arc arf arr arv av- ava avc avf avr c-- caa cac caf car cav cca ccc ccf ccr ccv cfa cfc cff cfr cfv cra crc crf crr crv cva cvc cvf cvr cvv faa fac faf far fav fca fcc fcf fcr fcv ffa ffc fff ffr ffv fra frc frf frr fva fvc ra- raa rac raf rar rav rca rcc rcf rcr rcv rfa rfc rff rfr rfv rra rrc rrf rrr rva rvc rvf rvr rvv v-a vaa vac var vav vca vcc vcf vcr vfa vfc vff vfr vfv vra vrc vrf vrr vva vvc vvr vvv