a-a aaa aaf aar aas aav af- afa aff afr afs afv ar- ara arf arr ars arv as- asa asf asr ass asv av- ava avf avr avs faa faf far fas fav ffa fff ffr ffs ffv fra frf frr frs fsa fsf fsr fss fsv fva ra- raa raf rar ras rav rfa rff rfr rfs rfv rra rrf rrr rrs rsa rsf rsr rss rsv rva rvf rvr rvs rvv saa saf sar sas sav sfa sff sfr sfs sfv sr- sra srf srr srs srv ss- ssa ssf ssr sss ssv sva svf svr svs svv v-a vaa var vas vav vfa vff vfr vfs vfv vra vrf vrr vrs vsa vsf vsr vss vsv vva vvr vvs vvv